chore(ci): cache node build in workflows

Building Node is failing often due to network error.
Caching a successful build will allow more reliable workflows.

.github/workflows/aws_tfhe_fast_tests.yml

@@ -191,10 +191,36 @@ jobs:
         run: |
           make test_user_doc
 
+      - name: Get Node version
+        run: |
+          echo "NODE_VERSION=$(make node_version)" >> "${GITHUB_ENV}"
+
+      - name: Node cache restoration
+        id: node-cache
+        uses: actions/cache/restore@6849a6489940f00c2f30c0fb92c6274307ccb58a #v4.1.2
+        with:
+          path: |
+            ~/.nvm
+            ~/.npm
+          key: node-${{ env.NODE_VERSION }}
+
+      - name: Install Node
+        if: steps.node-cache.outputs.cache-hit != 'true'
+        run: |
+          make install_node
+
+      - name: Node cache save
+        uses: actions/cache/save@6849a6489940f00c2f30c0fb92c6274307ccb58a #v4.1.2
+        if: steps.node-cache.outputs.cache-hit != 'true'
+        with:
+          path: |
+            ~/.nvm
+            ~/.npm
+          key: node-${{ env.NODE_VERSION }}
+
       - name: Run js on wasm API tests
         if: needs.should-run.outputs.wasm_test == 'true'
         run: |
-          make install_node
           make test_nodejs_wasm_api_ci
 
       - name: Gen Keys if required

.github/workflows/aws_tfhe_wasm_tests.yml

@@ -55,9 +55,35 @@ jobs:
         with:
           toolchain: stable
 
-      - name: Install web resources
+      - name: Get Node version
+        run: |
+          echo "NODE_VERSION=$(make node_version)" >> "${GITHUB_ENV}"
+
+      - name: Node cache restoration
+        id: node-cache
+        uses: actions/cache/restore@6849a6489940f00c2f30c0fb92c6274307ccb58a #v4.1.2
+        with:
+          path: |
+            ~/.nvm
+            ~/.npm
+          key: node-${{ env.NODE_VERSION }}
+
+      - name: Install Node
+        if: steps.node-cache.outputs.cache-hit != 'true'
         run: |
           make install_node
+
+      - name: Node cache save
+        uses: actions/cache/save@6849a6489940f00c2f30c0fb92c6274307ccb58a #v4.1.2
+        if: steps.node-cache.outputs.cache-hit != 'true'
+        with:
+          path: |
+            ~/.nvm
+            ~/.npm
+          key: node-${{ env.NODE_VERSION }}
+
+      - name: Install web resources
+        run: |
           make install_chrome_browser
           make install_chrome_web_driver
 

.github/workflows/benchmark_wasm_client.yml

@@ -102,9 +102,35 @@ jobs:
         with:
           toolchain: nightly
 
-      - name: Install web resources
+      - name: Get Node version
+        run: |
+          echo "NODE_VERSION=$(make node_version)" >> "${GITHUB_ENV}"
+
+      - name: Node cache restoration
+        id: node-cache
+        uses: actions/cache/restore@6849a6489940f00c2f30c0fb92c6274307ccb58a #v4.1.2
+        with:
+          path: |
+            ~/.nvm
+            ~/.npm
+          key: node-${{ env.NODE_VERSION }}
+
+      - name: Install Node
+        if: steps.node-cache.outputs.cache-hit != 'true'
         run: |
           make install_node
+
+      - name: Node cache save
+        uses: actions/cache/save@6849a6489940f00c2f30c0fb92c6274307ccb58a #v4.1.2
+        if: steps.node-cache.outputs.cache-hit != 'true'
+        with:
+          path: |
+            ~/.nvm
+            ~/.npm
+          key: node-${{ env.NODE_VERSION }}
+
+      - name: Install web resources
+        run: |
           make install_${{ matrix.browser }}_browser
           make install_${{ matrix.browser }}_web_driver
 

Makefile

@@ -122,6 +122,10 @@ install_node:
 	$(SHELL) -i -c 'nvm install $(NODE_VERSION)' || \
 	( echo "Unable to install node, unknown error." && exit 1 )
 
+.PHONY: node_version  # Return Node version that will be installed
+node_version:
+	@echo "$(NODE_VERSION)"
+
 .PHONY: install_dieharder # Install dieharder for apt distributions or macOS
 install_dieharder:
 	@dieharder -h > /dev/null 2>&1 || \