chore: import upstream snapshot with attribution

.github/actions/setup/action.yml

@@ -0,0 +1,45 @@
+name: Setup
+description: install dependencies and build
+
+inputs:
+  extra_filters:
+    description: 'Turbo additional filters to select packages to build'
+    required: false
+
+runs:
+  using: 'composite'
+  steps:
+    - uses: pnpm/action-setup@v4 # uses the version from package.json
+
+    - uses: actions/setup-node@v6
+      with:
+        node-version-file: '.tool-versions'
+        package-manager-cache: false
+
+    - name: Install Node Gyp Build
+      shell: ${{ runner.os == 'Windows' && 'pwsh' || 'bash' }}
+      run: |
+        npm install -g node-gyp-build
+
+    - name: Install dependencies
+      shell: ${{ runner.os == 'Windows' && 'pwsh' || 'bash' }}
+      run: pnpm i --frozen-lockfile
+
+    - name: Cache Turbo
+      uses: actions/cache@v5
+      with:
+        path: |
+          .turbo
+          node_modules/.cache/turbo
+        key: turbo-${{ runner.os }}-${{ github.workflow_ref }}
+        restore-keys: |
+          turbo-${{ runner.os }}-
+
+    - name: Build
+      shell: ${{ runner.os == 'Windows' && 'pwsh' || 'bash' }}
+      env:
+        BP_VERBOSE: 'true'
+        EXTRA_FILTERS: ${{ inputs.extra_filters }}
+      run: |
+        # shellcheck disable=SC2086 # EXTRA_FILTERS contains multiple space-separated filter arguments
+        pnpm turbo run build $EXTRA_FILTERS