docker: add an image to build custom circom for modular Picus

.github/workflows/docker-base-modular-push

@@ -0,0 +1,28 @@
+name: Docker Base Modular Image Push
+
+on: workflow_dispatch
+
+jobs:
+  build-base-docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          submodules: 'true'
+          token: ${{ secrets.RELEASE_TOKEN }}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Login to DockerHub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.SAAS_DOCKERHUB_USERNAME }}
+          password: ${{ secrets.SAAS_DOCKERHUB_TOKEN }}
+      - name: Build and push to DockerHub
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          push: true
+          file: resources/Dockerfile@base-modular
+          platforms: linux/amd64
+          tags: veridise/picus:base-modular