fix: only push image on push event

At the moment push can not be done on pull_request due to forked repo context execution. Do not have rights to access ghcr on the upstream repo. This commit checks if event is push to push the images to ghcr

Signed-off-by: Adrian Riobo <ariobolo@redhat.com>

Author: adrianriobo

.github/workflows/build.yml

@@ -34,14 +34,21 @@ jobs:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
 
-    - name: Build and push image (${{ matrix.arch }})
+    - name: Build image (${{ matrix.arch }})
       env:
         IMAGE_TAG: ${{ env.IMAGE_TAG }}-${{ matrix.arch }}
       run: |
         make oci-build
+
+    - name: Push image (${{ matrix.arch }})
+      if: github.event_name == 'push'
+      env:
+        IMAGE_TAG: ${{ env.IMAGE_TAG }}-${{ matrix.arch }}
+      run: |
         make oci-push
 
   manifest:
+    if: github.event_name == 'push'
     needs: build
     runs-on: ubuntu-24.04
 
@@ -62,7 +69,6 @@ jobs:
         make oci-manifest-push
 
     - name: Tag as latest (main branch only)
-      if: github.event_name == 'push'
       run: |
         make oci-tag
         make oci-push