Add simple lint workflow

.github/workflows/lint.yaml

@@ -0,0 +1,66 @@
+name: Lint
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+env:
+  PRE_COMMIT_HOME: ${{ github.workspace }}/.cache/pre-commit-cache
+
+jobs:
+  lint:
+    name: Linting check
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      # Python is required for pip installation of pre-commit
+      - name: Python setup
+        id: python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.9.5'
+
+      # Install pre-commit with pip
+      - name: Install pre-commit
+        run: pip install pre-commit
+
+      # Cache pre-commit environment
+      # the key consists relevant factors to allow updating, when pre-commit changes
+      - name: Pre-commit Environment Caching
+        uses: actions/cache@v2
+        with:
+          path: ${{ env.PRE_COMMIT_HOME }}
+          key: "precommit-0-${{ runner.os }}-${{ env.PRE_COMMIT_HOME }}-\
+          ${{ steps.python.outputs.python-version }}-\
+          ${{ hashFiles('./.pre-commit-config.yaml') }}"
+
+      # Make a user install for pre-commit by using PIP_USER=0
+      - name: Run pre-commit hooks
+        run: export PIP_USER=0; pre-commit run --all-files
+
+      # Prepare the Pull Request Payload artifact. If this fails, we
+      # we fail silently using the `continue-on-error` option. It's
+      # nice if this succeeds, but if it fails for any reason, it
+      # does not mean that our lint-test checks failed.
+      - name: Prepare Pull Request Payload artifact
+        id: prepare-artifact
+        if: always() && github.event_name == 'pull_request'
+        continue-on-error: true
+        run: cat $GITHUB_EVENT_PATH | jq '.pull_request' > pull_request_payload.json
+
+      # This only makes sense if the previous step succeeded. To
+      # get the original outcome of the previous step before the
+      # `continue-on-error` conclusion is applied, we use the
+      # `.outcome` value. This step also fails silently.
+      - name: Upload a Build Artifact
+        if: always() && steps.prepare-artifact.outcome == 'success'
+        continue-on-error: true
+        uses: actions/upload-artifact@v2
+        with:
+          name: pull-request-payload
+          path: pull_request_payload.json