github actions: fix docker push and load cannot be used at the same time

Author: weickmanna

.github/workflows/ktorbase.yml

@@ -57,7 +57,7 @@ jobs:
         uses: docker/build-push-action@v3
         with:
           context: .
-          load: true
+          load: ${{ github.event_name != 'release' }}
           push: ${{ github.event_name == 'release' }}
           tags: |
             linkedplanet/ktorbase:latest