feat: yarn-install action

yarn-install/action.yml

@@ -0,0 +1,48 @@
+# based on https://gist.github.com/belgattitude/042f9caf10d029badbde6cf9d43e400a
+name: 'Monorepo install (yarn)'
+description: 'Run yarn install with node_modules linker and cache enabled'
+inputs:
+  cwd:
+    description: "Changes node's process.cwd() if the project is not located on the root. Default to process.cwd()"
+    required: false
+    default: '.'
+  cache-prefix:
+    description: 'Add a specific cache-prefix'
+    required: false
+    default: 'default'
+  
+runs:
+  using: 'composite'
+  steps:
+    - name: ⚙️ Expose yarn config as "$GITHUB_OUTPUT"
+      id: yarn-config
+      shell: bash
+      working-directory: ${{ inputs.cwd }}
+      env:
+        YARN_ENABLE_GLOBAL_CACHE: 'false'
+      run: |
+        echo "CACHE_FOLDER=$(yarn config get cacheFolder)" >> $GITHUB_OUTPUT
+        echo "CURRENT_NODE_VERSION="node-$(node --version)"" >> $GITHUB_OUTPUT
+        echo "CURRENT_BRANCH=$(echo ${GITHUB_REF#refs/heads/} | sed -r 's,/,-,g')" >> $GITHUB_OUTPUT
+
+    - name: ♻️ Restore yarn cache
+      uses: actions/cache@v3
+      id: yarn-download-cache
+      with:
+        path: ${{ steps.yarn-config.outputs.CACHE_FOLDER }}
+        key: yarn-download-cache-${{ inputs.cache-prefix }}-${{ hashFiles(format('{0}/yarn.lock', inputs.cwd), format('{0}/.yarnrc.yml', inputs.cwd)) }}
+        restore-keys: |
+          yarn-download-cache-${{ inputs.cache-prefix }}-
+    
+    - name: 📥 Install dependencies
+      shell: bash
+      working-directory: ${{ inputs.cwd }}
+      run: yarn install --immutable --inline-builds
+      env:
+        # Overrides/align yarnrc.yml options (v3, v4) for a CI context
+        YARN_ENABLE_GLOBAL_CACHE: 'false' # Use local cache folder to keep downloaded archives
+        YARN_ENABLE_MIRROR: 'false' # Prevent populating global cache for caches misses (local cache only)
+        YARN_NM_MODE: 'hardlinks-local' # Reduce node_modules size
+        YARN_INSTALL_STATE_PATH: '.yarn/ci-cache/install-state.gz' # Might speed up resolution step when node_modules present
+        # Other environment variables
+        HUSKY: '0' # By default do not run HUSKY install