CI: try building and pushing container image

.gitea/workflows/rebuild.yml

@@ -1,16 +1,39 @@
-name: Rebuild Gitea container
-run-name: ${{ gitea.actor }} is testing actions
-on: [push]
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
 
 jobs:
-  Build container image:
+  build-and-push:
     runs-on: ubuntu-latest
+
     steps:
-      - run: echo "Trigged by ${{ gitea.event_name }}"
-      - run: echo "Name of branch is ${{ gitea.ref }} and repository ${{ gitea.repository }}"
-      - name: Check out repository code
+      - name: Checkout Repository
         uses: actions/checkout@v3
-      - name: List all files
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Build and Push Docker Image
         run: |
-          ls ${{ gitea.workspace }}
-      - run: echo "Status is ${{ job.status }}" 
+          # Set your Docker registry and image name
+          REGISTRY_NAME="git.kucharczyk.xyz/${DOCKER_USERNAME}/containers/gitea"
+          # Optionally, set a tag for your image (e.g., a commit SHA)
+          #TAG="${{ gitea.sha }}"
+          TAG="latest"
+          
+          # Build the Docker image
+          docker buildx create --use
+          docker buildx build --file Dockerfile -t "${REGISTRY_NAME}:${TAG}" .
+
+          # Log in to the container registry (replace with your authentication method)
+          docker login -u "${{ gitea.repository_owner }}" -p "$DOCKER_PASSWORD" your-registry-url.com
+
+          # Push the image to the container registry
+          docker push "${REGISTRY_NAME}:${TAG}"
+
+        env:
+          DOCKER_USERNAME: ${{ gitea.repository_owner }}
+          DOCKER_PASSWORD: ${{ secrets.GITEA_TOKEN}}