Run tests in CI and build multi-arch Docker images

- Build (main, develop): vet and unit tests, then a linux/amd64 and
  linux/arm64 image build without pushing
- Publish (version branches): same tests, then build and push both
  platforms
- Integration tests (manual): run the testcontainers suite

.gitea/workflows/integration-tests.yaml

@@ -5,43 +5,14 @@ on:
 
 jobs:
   integration-test:
+    # Needs access to a Docker daemon: the tests start PostgreSQL with testcontainers.
     runs-on: ubuntu-latest
-    container:
-      image: golang:1.25
-      options: --privileged
-
-    services:
-      postgres:
-        image: postgres:15-alpine
-        env:
-          POSTGRES_USER: testuser
-          POSTGRES_PASSWORD: testpass
-          POSTGRES_DB: music_server_test
-        ports:
-          - 5432:5432
-        options: >-
-          --health-cmd pg_isready
-          --health-interval 10s
-          --health-timeout 5s
-          --health-retries 5
-
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-
-      - name: Install dependencies
-        run: go mod download
-
-      - name: Install testcontainers
-        run: go install github.com/testcontainers/testcontainers-go@latest
-
-      - name: Run integration tests
-        env:
-          DB_HOST: postgres
-          DB_PORT: 5432
-          DB_USERNAME: testuser
-          DB_PASSWORD: testpass
-          DB_NAME: music_server_test
-          MUSIC_PATH: ./testMusic
-          CHARACTERS_PATH: ./testCharacters
-        run: go test -v -timeout 30m ./...
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+      - name: Generate templ components
+        run: go tool templ generate
+      - name: Integration tests
+        run: go test -tags integration -race -timeout 15m ./...