Add workflow to automatically build and push container build

.gitea/workflows/build-push.yaml

@@ -0,0 +1,39 @@
+name: Build and Push container image
+run-name: ${{ gitea.actor }} is building and pushing
+
+on:
+  create:
+    tags: "*"
+
+env:
+  GITEA_DOMAIN: git.fjla.uk
+  GITEA_REGISTRY_USER: fred.boniface
+  RESULT_IMAGE_NAME: fred.boniface/label-api-next
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    container:
+      image: catthehacker/ubuntu:act-latest
+      options: --privileged
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to Gitea Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.GITEA_DOMAIN }}
+          username: ${{ env.GITEA_REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
+      - name: Build and Push image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: |
+            ${{ env.GITEA_DOMAIN }}/${{ env.RESULT_IMAGE_NAME }}:${{ gitea.ref_name }}
+            ${{ env.GITEA_DOMAIN }}/${{ env.RESULT_IMAGE_NAME }}:latest