Push Docker image to Harbor on all pushes during PR

.github/workflows/ci-build.yml

@@ -35,9 +35,8 @@ jobs:
         run: yarn e2e
 
   docker:
-    # This job triggers only if all the other jobs succeed and does different things depending on the context.
-    # The job builds the Docker image in all cases and also pushes the image to Harbor only if something is
-    # pushed to the main or develop branch.
+    # This job triggers only if all the other jobs succeed. It builds the Docker image and if successful,
+    # it pushes it to Harbor.
     needs: [test]
     name: Docker
     runs-on: ubuntu-20.04
@@ -58,10 +57,10 @@ jobs:
         with:
           images: harbor.stfc.ac.uk/datagateway/scigateway
 
-      - name: ${{ github.event_name == 'push' && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/develop') && 'Build and push Docker image to Harbor' || 'Build Docker image' }}
+      - name: Build and push Docker image to Harbor
         uses: docker/build-push-action@3b5e8027fcad23fda98b2e3ac259d8d67585f671 # v4.0.0
         with:
           context: .
-          push: ${{ github.event_name == 'push' && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/develop') }}
+          push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}