ci: use node:20-alpine with docker-cli for runner compatibility

.gitea/workflows/docker-build.yml

@@ -9,27 +9,30 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
+      - name: Install Docker CLI
+        run: apk add --no-cache docker-cli
+
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Login to Gitea Container Registry
-        uses: docker/login-action@v3
-        with:
-          registry: git.mischlabs.de
-          username: ${{ secrets.REGISTRY_USER }}
-          password: ${{ secrets.REGISTRY_TOKEN }}
+      - name: Login to Gitea Registry
+        run: |
+          echo "${{ secrets.REGISTRY_TOKEN }}" | \
+            docker login git.mischlabs.de \
+              -u "${{ secrets.REGISTRY_USER }}" \
+              --password-stdin
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+      - name: Build Docker Image
+        run: |
+          docker build \
+            --build-arg NEXT_PUBLIC_API_URL="${{ vars.NEXT_PUBLIC_API_URL }}" \
+            --build-arg NEXT_PUBLIC_APP_URL="${{ vars.NEXT_PUBLIC_APP_URL }}" \
+            -t git.mischlabs.de/mrdiderot/michess:latest \
+            .
 
-      - name: Build and Push
-        uses: docker/build-push-action@v5
-        with:
-          context: .
-          push: true
-          tags: git.mischlabs.de/mrdiderot/michess:latest
-          build-args: |
-            NEXT_PUBLIC_API_URL=${{ vars.NEXT_PUBLIC_API_URL }}
-            NEXT_PUBLIC_APP_URL=${{ vars.NEXT_PUBLIC_APP_URL }}
-          cache-from: type=registry,ref=git.mischlabs.de/mrdiderot/michess:buildcache
-          cache-to: type=registry,ref=git.mischlabs.de/mrdiderot/michess:buildcache,mode=max
+      - name: Push to Registry
+        run: docker push git.mischlabs.de/mrdiderot/michess:latest
+
+      - name: Logout
+        if: always()
+        run: docker logout git.mischlabs.de