build: Add hadolint

Author: limakzi

.github/workflows/code-quality.yaml

@@ -0,0 +1,29 @@
+---
+name: Code quality
+run-name: code-quality-${{ github.event.number }} ${{ github.event.pull_request.title }}
+
+on:
+  pull_request:
+    branches:
+      - main
+
+# the `concurrency` settings ensure that not too many CI jobs run in parallel
+concurrency:
+  # group by workflow and ref; the last slightly strange component ensures that for pull
+  # requests, we limit to 1 concurrent job, but for the master branch we don't
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.ref != 'refs/heads/master' || github.run_number }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
+
+jobs:
+  hadolint:
+    name: Code quality - hadolint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Run hadolint
+        uses: hadolint/hadolint-action@v3.1.0
+        with:
+          recursive: true