ci(ct-base): switch some steps to run on push or schedule IQSS#8932

Instead of only running the steps to push images to Docker Hub
on a Git push event, also make it possible to run them an anything
not being a pull_request event. (Like a schedule)

.github/workflows/container_base_push.yml

@@ -53,18 +53,18 @@ jobs:
             - name: Build base container image with local architecture
               run: mvn -f modules/container-base -Pct package
 
-            - if: ${{ github.event_name == 'push' }} # run only if this is a push - PRs have no access to secrets
+            - if: ${{ github.event_name != 'pull_request' }} # run only if this is not a pull request - PRs have no access to secrets
               name: Log in to the Container registry
               uses: docker/login-action@v1
               with:
                   username: ${{ secrets.DOCKERHUB_USERNAME }}
                   password: ${{ secrets.DOCKERHUB_TOKEN }}
-            - if: ${{ github.event_name == 'push' }} # run only if this is a push - multi-arch makes no sense with PR
+            - if: ${{ github.event_name != 'pull_request' }} # run only if this is not a pull request - multi-arch makes no sense with PR
               name: Set up QEMU for multi-arch builds
               uses: docker/setup-qemu-action@v2
             - name: Re-set image tag based on branch
               if: ${{ github.ref == 'master' }}
               run: echo "IMAGE_TAG=release"
-            - if: ${{ github.event_name == 'push' }} # run only if this is a push - tag push will only succeed in upstream
+            - if: ${{ github.event_name != 'pull_request' }} # run only if this is not a pull request - tag push will only succeed in upstream
               name: Deploy multi-arch base container image to Docker Hub
               run: mvn -f modules/container-base -Pct deploy -Dbase.image.tag=${{ env.IMAGE_TAG }} -Ddocker.registry=${{ env.REGISTRY }}