Add GitHub Actions workflow for building and pushing Docker container

.gitea/workflows/build.yaml

@@ -0,0 +1,48 @@
+name: Build and Push container
+run-name: Build and Push container
+
+on:
+  push:
+    tags:
+      - '[0-9]+.[0-9]+.[0-9]+'
+
+env:
+  IMAGE: git.kvant.cloud/phoenix/metricbeat-hpc
+  VERSION: ${{ github.ref_name }}
+
+jobs:
+  build_besu:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to gitea registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.kvant.cloud
+          username: ${{ vars.PHOENIX_PACKAGE_WRITER_USERNAME }}
+          password: ${{ secrets.PHOENIX_PACKAGE_WRITER_TOKEN }}
+
+      - name: Update Dockerfile FROM version
+        run: sed -i "s|^FROM .\+|FROM docker.elastic.co/beats/metricbeat-oss:${{ env.VERSION }}|" Dockerfile
+
+      - name: Build and push to gitea registry
+        uses: docker/build-push-action@v6
+        with:
+          platforms: linux/s390x
+          push: true
+          context: .
+          build-args: |
+            VERSION=${{ env.VERSION }}
+          image: ${{ env.IMAGE }}
+          cache-from: |
+            type=registry,ref=${{ env.IMAGE }}:${{ env.VERSION }}
+            type=registry,ref=${{ env.IMAGE }}:latest            
+          cache-to: type=inline
+          tags: |
+            ${{ env.IMAGE }}:${{ env.VERSION }}
+            ${{ env.IMAGE }}:latest