⚙️ config(ci): Add workflow to lint compose files.

.github/workflows/ci:lint-compose.yml

@@ -0,0 +1,45 @@
+name: ci:lint-compose
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  merge_group:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+
+  lint:
+    name: Continuous integration (lint compose)
+
+    strategy:
+      matrix:
+
+        config:
+          - sources
+          - build
+
+        include:
+
+          - config: sources
+            compose-flags: ''
+
+          - config: build
+            compose-flags: >-
+              --env-file .env -f compose.yaml
+              --env-file .deploy/ghcr.io/.env -f .deploy/ghcr.io/compose.yaml
+
+    runs-on: ubuntu-latest
+    timeout-minutes: 1
+
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v4
+
+      - name: Lint compose (${{ matrix.config }}) 👕
+        run: |
+          docker compose ${{ matrix.compose-flags }} config