Update cicd_docker.yml

.github/workflows/cicd_docker.yml

@@ -8,6 +8,8 @@ on:
 
 env:
   DOCKER_IMAGE_NAME: pdal_ign_plugin
+  # Use docker.io for Docker Hub if empty
+  REGISTRY: ghcr.io
 
 jobs:
   build_docker_image_and_run_tests:
@@ -24,4 +26,31 @@ jobs:
     - name: Run tests in docker image
       run: docker run ${{ env.DOCKER_IMAGE_NAME }}:test python -m pytest
 
-
+    # Login against a Docker registry except on PR
+    # https://github.com/docker/login-action
+    - name: Log into registry ${{ env.REGISTRY }}
+      if: github.event_name != 'pull_request'
+      uses: docker/login-action@v2
+      with:
+        registry: ${{ env.REGISTRY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    # Extract metadata (tags, labels) for Docker
+    # https://github.com/docker/metadata-action
+    - name: Extract Docker metadata
+      id: meta
+      uses: docker/metadata-action@v3
+      with:
+        images: ${{ env.REGISTRY }}/${{ env.DOCKER_IMAGE_NAME }}
+
+    # Build and push Docker image with Buildx (don't push on PR)
+    # https://github.com/docker/build-push-action
+    - name: Build and push Docker image
+      id: build-and-push
+      uses: docker/build-push-action@v3
+      with:
+        context: .
+        push: ${{ github.event_name != 'pull_request' }}
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}