Revert "chore: make CI/CD to publish Quay image on PRs"

This reverts commit 3d90fec.

Author: aleortega

.github/workflows/pr.yml

@@ -23,6 +23,6 @@ jobs:
       service-name: ${{ matrix.service-name }}
       unity-docker-image: ${{ matrix.unity-docker-image }}
       platform-target: ${{ matrix.platform-target }}
-      upload-image: true
+      upload-image: false
       docker-tag: pr-${{ github.event.number }}
     secrets: inherit