added docker compose linter workflow

.forgejo/workflows/lint.yaml

@@ -0,0 +1,17 @@
+name: Docker Compose Linter
+on: [push]  # yamllint disable-line rule:truthy
+jobs:
+  Docker Compose Linter:
+    runs-on: docker
+    steps:
+      - uses: actions/checkout@v3
+      - name: Lint YAML
+        uses: actions/yamllint
+
+      - run: echo ${{ steps.yaml-lint.outputs.logfile }}
+
+      - uses: actions/upload-artifact@v2
+        if: always()
+        with:
+          name: yamllint-logfile
+          path: ${{ steps.yaml-lint.outputs.logfile }}