chore: import upstream snapshot with attribution

.github/actions/pnpm-node-install/action.yaml

@@ -0,0 +1,26 @@
+name: Install Node, pnpm and dependencies.
+description: Install Node, pnpm and dependencies using cache.
+
+inputs:
+  node-version:
+    description: Node.js version
+    required: true
+    default: 'lts/*'
+
+runs:
+  using: composite
+  steps:
+    - uses: pnpm/action-setup@v5.0.0
+      name: Install pnpm
+      with:
+        run_install: false
+    - name: Use Node.js
+      uses: actions/setup-node@v6.3.0
+      with:
+        node-version: ${{ inputs.node-version }}
+        registry-url: 'https://registry.npmjs.org'
+        cache: 'pnpm'
+        cache-dependency-path: '**/pnpm-lock.yaml'
+    - name: Install JS dependencies
+      run: pnpm install
+      shell: bash

.github/actions/uv-python-install/action.yaml

@@ -0,0 +1,37 @@
+name: Install Python, uv and dependencies.
+description: Install Python, uv and project dependencies using cache
+
+inputs:
+  python-version:
+    description: Python version
+    required: true
+    default: '3.10'
+  uv-version:
+    description: uv version
+    required: true
+    default: 'latest'
+  uv-args:
+    description: Extra uv args, for example dependencies to install, e.g. --extra tests --extra dev.
+    required: false
+  working-directory:
+    description: Working directory for uv command.
+    required: false
+    default: .
+
+runs:
+  using: composite
+  steps:
+    - name: Install uv
+      uses: astral-sh/setup-uv@v8.0.0
+      with:
+        version: ${{ inputs.uv-version }}
+        enable-cache: true
+    - name: Set up Python ${{ inputs.python-version }}
+      id: setup_python
+      uses: actions/setup-python@v6.2.0
+      with:
+        python-version: ${{ inputs.python-version }}
+    - name: Install Python dependencies
+      run: uv sync --all-packages ${{ inputs.uv-args }}
+      shell: bash
+      working-directory: ${{ inputs.working-directory }}