Create build.yaml

.github/workflows/build.yaml

@@ -0,0 +1,38 @@
+name: Docker Build
+
+on:
+  push:
+
+env:
+  REGISTRY: ghcr.io
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      packages: write
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+
+    - name: Log in to the Container registry
+      uses: docker/login-action@v2
+      with:
+        registry: ${{ env.REGISTRY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v2
+
+    - name: Build and push Backend Docker image
+      uses: docker/build-push-action@v4
+      with:
+        context: .
+        file: Dockerfile
+        push: true
+        tags: ${{ env.REGISTRY }}/${{ github.repository_owner }}/fdroid-reposerver:latest