ci: skip CI push step on PRs

Signed-off-by: Erhan Cagirici <erhan@upbound.io>

Author: erhancagirici

.github/workflows/ci.yml

@@ -131,6 +131,7 @@ jobs:
   # pushes them as a multi-platform package.
   push:
     runs-on: ubuntu-24.04
+    if: ${{ github.event_name != 'pull_request' }}
     permissions:
       contents: read
       packages: write