diff --git a/.github/workflows/publish_docker_images.yml b/.github/workflows/compiler_publish_docker_images.yml
similarity index 85%
rename from .github/workflows/publish_docker_images.yml
rename to .github/workflows/compiler_publish_docker_images.yml
index 77a21417f..78c33d767 100644
--- a/.github/workflows/publish_docker_images.yml
+++ b/.github/workflows/compiler_publish_docker_images.yml
@@ -1,30 +1,8 @@
 # Build and publish Docker images for different applications using AWS EC2.
-name: Publish Docker Images
+name: Compiler - Docker images build & publish
 
 on:
-  workflow_dispatch:
-    inputs:
-      instance_id:
-        description: 'Instance ID'
-        type: string
-      instance_image_id:
-        description: 'Instance AMI ID'
-        type: string
-      instance_type:
-        description: 'Instance product type'
-        type: string
-      runner_name:
-        description: 'Action runner name'
-        type: string
-      request_id:
-        description: 'Slab request ID'
-        type: string
-      matrix_item:
-        description: 'Build matrix item'
-        type: string
-
-env:
-  THIS_FILE: .github/workflows/continuous-integration.yml
+  workflow_call:
 
 jobs:
   BuildAndPushDockerImages:
@@ -94,6 +72,7 @@ jobs:
       - name: Build Tag and Publish
         if: ${{ steps.login.conclusion != 'skipped' }}
         run: |
+          cd compilers/concrete-compiler
           docker build -t "${IMAGE}" -f builders/Dockerfile.hpx-env .
           docker push "${IMAGE}:latest"
 
@@ -121,6 +100,7 @@ jobs:
       - name: Build Tag and Publish
         if: ${{ steps.login.conclusion != 'skipped' }}
         run: |
+          cd compilers/concrete-compiler
           docker build -t "${IMAGE}" -f builders/Dockerfile.cuda-env .
           docker image tag "${IMAGE}" "${IMAGE}:${TAG}"
           docker push "${IMAGE}:latest"
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4fa120dbe..23827e1f6 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -20,7 +20,7 @@ jobs:
       optimizer: ${{ steps.optimizer.outputs.any_changed }}
       concrete-cpu: ${{ steps.concrete-cpu.outputs.any_changed }}
       concrete-cuda: ${{ steps.concrete-cuda.outputs.any_changed }}
-      test-all: ${{ steps.test-all.outputs.test-all }}
+      push-main: ${{ steps.github.outputs.push-main }}
     steps:
       - name: Checkout the repository
         uses: actions/checkout@v3
@@ -58,16 +58,16 @@ jobs:
         with:
           files: backends/concrete-cuda
       
-      - name: Set the test-all
-        id: test-all
+      - name: Set some github event outputs
+        id: github
         if: github.event_name == 'push' && github.ref == 'refs/heads/main'
-        run: echo "test-all=true" >> "$GITHUB_OUTPUT"
+        run: echo "push-main=true" >> "$GITHUB_OUTPUT"
 
 #################################################
 # concrete-python jobs ##########################
   concrete-python:
     needs: file-change
-    if: needs.file-change.outputs.concrete-python == 'true' || needs.file-change.outputs.test-all
+    if: needs.file-change.outputs.concrete-python == 'true' || needs.file-change.outputs.push-main
     uses: ./.github/workflows/concrete_python_build_and_test.yml
     secrets: inherit
 
@@ -78,18 +78,21 @@ jobs:
     if: needs.file-change.outputs.compiler == 'true'
     uses: ./.github/workflows/compiler_format_and_linting.yml
 
-  compiler-aws-tests:
+  compiler-cpu-build:
     needs: file-change
-    if: needs.file-change.outputs.compiler == 'true' || needs.file-change.outputs.test-all
-    runs-on: ubuntu-latest
-    steps:
-      - name: Launch compiler test on AWS using Slab
-        uses: mshick/add-pr-comment@v2
-        with:
-          allow-repeats: true
-          message: |
-            @slab-ci compiler-cpu-build
-            @slab-ci compiler-gpu-build
+    if: needs.file-change.outputs.compiler == 'true' || needs.file-change.outputs.push-main == 'true'
+    uses: ./.github/workflows/start_slab.yml
+    secrets: inherit
+    with:
+      command: compiler-cpu-build
+
+  compiler-gpu-build:
+    needs: file-change
+    if: needs.file-change.outputs.compiler == 'true' || needs.file-change.outputs.push-main == 'true'
+    uses: ./.github/workflows/start_slab.yml
+    secrets: inherit
+    with:
+      command: compiler-gpu-build
 
   compiler-macos-tests:
     needs: file-change
@@ -97,11 +100,19 @@ jobs:
     uses: ./.github/workflows/compiler_macos_build_and_test.yml
     secrets: inherit
 
+  compiler-publish-docker-images:
+    needs: file-change
+    if: needs.file-change.outputs.compiler == 'true' && needs.file-change.outputs.push-main == 'true'
+    uses: ./.github/workflows/start_slab.yml
+    secrets: inherit
+    with:
+      command: compiler-publish-docker-images
+
 #################################################
 # Optimizer jobs ################################
   optimizer:
     needs: file-change
-    if: needs.file-change.outputs.optimizer == 'true' || needs.file-change.outputs.test-all
+    if: needs.file-change.outputs.optimizer == 'true' || needs.file-change.outputs.push-main
     uses: ./.github/workflows/optimizer.yml
     secrets: inherit
 
@@ -109,7 +120,7 @@ jobs:
 # ConcreteCPU jobs ##############################
   concrete-cpu:
     needs: file-change
-    if: needs.file-change.outputs.concrete-cpu == 'true' || needs.file-change.outputs.test-all
+    if: needs.file-change.outputs.concrete-cpu == 'true' || needs.file-change.outputs.push-main
     uses: ./.github/workflows/concrete_cpu_test.yml
     secrets: inherit
 
@@ -117,6 +128,6 @@ jobs:
 # Concrete-cuda jobs ############################
   concrete-cuda:
     needs: file-change
-    if: needs.file-change.outputs.concrete-cuda == 'true' || needs.file-change.outputs.test-all
+    if: needs.file-change.outputs.concrete-cuda == 'true' || needs.file-change.outputs.push-main
     uses: ./.github/workflows/concrete_cuda_test.yml
     secrets: inherit
diff --git a/.github/workflows/start_ml_benchmarks.yml b/.github/workflows/start_ml_benchmarks.yml
deleted file mode 100644
index 9c7616b7f..000000000
--- a/.github/workflows/start_ml_benchmarks.yml
+++ /dev/null
@@ -1,30 +0,0 @@
-# Start application benchmarks job on Slab CI bot.
-name: Start ML benchmarks
-
-on:
-  workflow_dispatch:
-
-  # Have a weekly benchmark run on main branch to be available on Monday morning (Paris time)
-# TODO: uncomment this section once MLBenchmarks are implemented
-#  schedule:
-#    # * is a special character in YAML so you have to quote this string
-#    # At 1:00 every Thursday
-#    # Timezone is UTC, so Paris time is +2 during the summer and +1 during winter
-#    - cron: '0 1 * * THU'
-
-jobs:
-  start-ml-benchmarks:
-    steps:
-      - name: Start AWS job in Slab
-        shell: bash
-        # TODO: step result must be correlated to HTTP return code.
-        run: |
-          PAYLOAD='{"command": "ml-bench", "git_ref": ${{ github.ref }}, "sha": ${{ github.sha }}}'
-          SIGNATURE="$(slab/scripts/hmac_calculator.sh ${PAYLOAD} '${{ secrets.JOB_SECRET }}')"
-          curl -v -k \
-          -H "Content-Type: application/json" \
-          -H "X-Slab-Repository: ${{ github.repository }}" \
-          -H "X-Slab-Command: start_data" \
-          -H "X-Hub-Signature-256: sha256=${SIGNATURE}" \
-          -d @${{ PAYLOAD }} \
-          ${{ secrets.SLAB_URL }}
diff --git a/.github/workflows/start_aws_builds.yml b/.github/workflows/start_slab.yml
similarity index 55%
rename from .github/workflows/start_aws_builds.yml
rename to .github/workflows/start_slab.yml
index ce6c665fe..3d20a96ed 100644
--- a/.github/workflows/start_aws_builds.yml
+++ b/.github/workflows/start_slab.yml
@@ -1,19 +1,31 @@
-# Start all AWS build jobs on Slab CI bot.
-name: Start all AWS builds
+# Start job on Slab CI bot given by input command.
+name: Start AWS job
 
 on:
-  push:
-    branches:
-      - 'main'
+  workflow_call:
+    inputs:
+      command:
+        required: true
+        type: string
   workflow_dispatch:
+    inputs:
+      command:
+        required: true
+        type: string
+
+env:
+  GIT_REF: ${{ github.head_ref }}
 
 jobs:
-  start-builds:
-    strategy:
-      matrix:
-        command: [cpu-build, gpu-build, docker-images-build]
+  sl:
     runs-on: ubuntu-latest
     steps:
+      - name: Get git ref
+        # github.head_ref is only available from a Pull Request
+        if: env.GIT_REF == ''
+        run: |
+          echo "GIT_REF=${{ github.ref }}" >> $GITHUB_ENV
+
       - name: Checkout Slab repo
         uses: actions/checkout@v3
         with:
@@ -25,9 +37,10 @@ jobs:
         shell: bash
         # TODO: step result must be correlated to HTTP return code.
         run: |
-          echo -n '{"command": "${{ matrix.command }}", "git_ref": "${{ github.ref }}", "sha": "${{ github.sha }}"}' > command.json
+          echo -n '{"command": "${{ inputs.command }}", "git_ref": "${{ env.GIT_REF }}", "sha": "${{ github.sha }}"}' > command.json
           SIGNATURE="$(slab/scripts/hmac_calculator.sh command.json '${{ secrets.JOB_SECRET }}')"
           curl -v -k \
+          --fail-with-body \
           -H "Content-Type: application/json" \
           -H "X-Slab-Repository: ${{ github.repository }}" \
           -H "X-Slab-Command: start_aws" \
diff --git a/ci/slab.toml b/ci/slab.toml
index c19c83fcf..262cda103 100644
--- a/ci/slab.toml
+++ b/ci/slab.toml
@@ -12,6 +12,13 @@ instance_type = "m6i.16xlarge"
 subnet_id = "subnet-a886b4c1"
 security_group= ["sg-0bf1c1d79c97bc88f", ]
 
+[profile.m6i-metal]
+region = "eu-west-3"
+image_id = "ami-0a24aaee029d1295c"
+instance_type = "m6i.metal"
+subnet_id = "subnet-a886b4c1"
+security_group= ["sg-0bf1c1d79c97bc88f", ]
+
 [profile.gpu]
 region = "us-east-1"
 image_id = "ami-0c4773f5626d919b6"
@@ -44,10 +51,10 @@ profile = "gpu"
 check_run_name = "Compiler Performances Benchmarks (GPU)"
 
 # Trigger Docker images build
-[command.docker-images-build]
-workflow = "publish_docker_images.yml"
-profile = "m6i-old"
-check_run_name = "AWS Docker images build & publish (Slab)"
+[command.compiler-publish-docker-images]
+workflow = "compiler_publish_docker_images.yml"
+profile = "m6i-cpu-test"
+check_run_name = "Compiler - Docker images build & publish"
 
 # Trigger ML benchmarks by running each use cases subset in parallel.
 [command.ml-bench]
diff --git a/compilers/concrete-compiler/builders/Dockerfile.concrete-compiler-env b/compilers/concrete-compiler/builders/Dockerfile.concrete-compiler-env
index 130f3511b..8c8fdb11a 100644
--- a/compilers/concrete-compiler/builders/Dockerfile.concrete-compiler-env
+++ b/compilers/concrete-compiler/builders/Dockerfile.concrete-compiler-env
@@ -14,6 +14,7 @@ RUN ccache -F 0
 # Install Rust
 RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
 ENV PATH=/root/.cargo/bin:$PATH
+RUN rustup install nightly
 SHELL ["/bin/bash", "-c"]
 # Install boost
 ADD https://boostorg.jfrog.io/artifactory/main/release/1.71.0/source/boost_1_71_0.tar.gz /boost_1_71_0.tar.gz