only log in to docker hub if push is true (#19)

Author: dennisvang

.github/workflows/docker-publish.yml

@@ -64,6 +64,7 @@ jobs:
 
       - # https://github.com/docker/login-action
         name: Log in to Docker Hub
+        if: inputs.push == 'true'
         uses: docker/login-action@v3
         with:
           username: ${{ vars.DOCKER_HUB_USERNAME }}