ci: only rebuild docker if event is pull request and is from outside (#32997)

.github/workflows/ci-test-e2e.yml

@@ -133,7 +133,7 @@ jobs:
 
       # if we are testing a PR from a fork, we need to build the docker image at this point
       - uses: ./.github/actions/build-docker
-        if: github.event.pull_request.head.repo.full_name != github.repository
+        if: github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository
         with:
           CR_USER: ${{ secrets.CR_USER }}
           CR_PAT: ${{ secrets.CR_PAT }}