fix: enable PR image push for test workflow

Push PR images to registry so the upgrade test step can pull them

Author: adityathebe

.github/workflows/build-and-test.yml

@@ -55,7 +55,7 @@ jobs:
         with:
           context: .
           platforms: linux/amd64,linux/arm64
-          push: ${{ github.event_name != 'pull_request' }}
+          push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: |