ci: add parallel validation workflow

.gitea/workflows/CI.yml

@@ -0,0 +1,34 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+env:
+  REGISTRY: docker.lechner-systems.at
+  IMAGE_NAME: lechnersystems/maintenance
+
+jobs:
+  javascript:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Check JavaScript syntax
+        run: node --check script.js
+
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Build Docker image
+        run: docker build --build-arg APP_VERSION=${{ gitea.sha }} --build-arg VCS_REF=${{ gitea.sha }} --tag "$REGISTRY/$IMAGE_NAME:ci-${{ gitea.sha }}" .