Moves docker stuff from deploy into build

.github/workflows/build.yml

@@ -2,24 +2,57 @@ name: Build and test
 
 on:
   pull_request:
+  push:
+    branches:
+      - main
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{github.repository}}
 
 jobs:
-  docker:
-    name: Docker tests
+  build:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
 
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      - name: Build Docker image
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: amd64,arm64
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) }}
+            type=raw,value={{date 'YYYYMMDD-HHmmss'}}-{{sha}}
+
+      - name: Build and push Docker image
         uses: docker/build-push-action@v6
         with:
           context: .
-          tags: ${{ github.repository }}:test
-
-      - name: Test Docker image
-        run: docker run --rm --user root:root --entrypoint bash ${{ github.repository }}:test -c 'pip install pytest-asyncio && pytest --pyargs gcn_classic_to_kafka'
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
 
   python:
     name: Python tests