Add codeberg CI instructions

.forgejo/workflows/docker-build.yml

@@ -0,0 +1,43 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    tags: [v*]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Codeberg Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: codeberg.org
+          username: ${{ secrets.CODEBERG_USERNAME }}
+          password: ${{ secrets.CODEBERG_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: codeberg.org/lvl0/incr
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=raw,value=latest
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./docker/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max