ci: simplify workflows to use docker CLI only

- remove Node-based actions (checkout, buildx, login, build-push)
- rely on gitea workspace checkout and plain docker commands
- avoid Node requirement on self-hosted runner

.gitea/workflows/build.yml

@@ -13,56 +13,26 @@ jobs:
   build:
     runs-on: linux
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+      - name: Build Docker image
+        run: |
+          echo "Building Docker image..."
+          docker build -t karaokepedia:latest .
+          docker tag karaokepedia:latest karaokepedia:${{ github.sha }}
+          echo "✅ Image built successfully"
       
       - name: Log in to Docker Hub
-        uses: docker/login-action@v3
-        with:
-          username: ${{ secrets.DOCKER_USERNAME }}
-          password: ${{ secrets.DOCKER_PASSWORD }}
+        run: |
+          echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
       
-      # Uncomment if using GitHub Container Registry
-      # - name: Log in to GitHub Container Registry
-      #   uses: docker/login-action@v3
-      #   with:
-      #     registry: ghcr.io
-      #     username: ${{ github.actor }}
-      #     password: ${{ secrets.GITHUB_TOKEN }}
-
-      # Uncomment if using Gitea Container Registry
-      # - name: Log in to Gitea Container Registry
-      #   uses: docker/login-action@v3
-      #   with:
-      #     registry: gitea.yourdomain.com
-      #     username: ${{ secrets.GITEA_USERNAME }}
-      #     password: ${{ secrets.GITEA_PASSWORD }}
-
-      - name: Extract metadata
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ secrets.DOCKER_USERNAME }}/${{ env.IMAGE_NAME }}
-          # Use this for GHCR:
-          # images: ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}
-          # Use this for Gitea:
-          # images: gitea.yourdomain.com/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}
-          tags: |
-            type=raw,value=latest
-            type=sha,prefix={{branch}}-
-
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v5
-        with:
-          context: .
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
-
-      - name: Image digest
-        run: echo ${{ steps.meta.outputs.digest }}
+      - name: Push Docker image
+        run: |
+          # Push with registry prefix if secrets are configured
+          if [ -n "${{ secrets.DOCKER_USERNAME }}" ]; then
+            docker tag karaokepedia:latest ${{ secrets.DOCKER_USERNAME }}/${{ env.IMAGE_NAME }}:latest
+            docker tag karaokepedia:latest ${{ secrets.DOCKER_USERNAME }}/${{ env.IMAGE_NAME }}:main-${{ github.sha }}
+            docker push ${{ secrets.DOCKER_USERNAME }}/${{ env.IMAGE_NAME }}:latest
+            docker push ${{ secrets.DOCKER_USERNAME }}/${{ env.IMAGE_NAME }}:main-${{ github.sha }}
+            echo "✅ Pushed to Docker Hub: ${{ secrets.DOCKER_USERNAME }}/${{ env.IMAGE_NAME }}"
+          else
+            echo "⚠️ Docker Hub credentials not configured, skipping push"
+          fi

.gitea/workflows/pr-validation.yml

@@ -49,9 +49,6 @@ jobs:
   validate-docker:
     runs-on: linux
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-
       - name: Validate Dockerfile syntax
         run: |
           if [ -f "Dockerfile" ]; then
@@ -86,22 +83,7 @@ jobs:
   build-test:
     runs-on: linux
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Build Docker image (no push)
-        uses: docker/build-push-action@v5
-        with:
-          context: .
-          push: false
-          tags: karaokepedia:pr-${{ github.event.pull_request.number }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
-
-      - name: Test container starts
+      - name: Build and test Docker image
         run: |
           docker build -t karaokepedia:test .
           CONTAINER_ID=$(docker run -d -p 8080:80 karaokepedia:test)
@@ -145,9 +127,6 @@ jobs:
   check-files:
     runs-on: linux
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-
       - name: Check required files exist
         run: |
           REQUIRED_FILES=(