CI: Fix typo

.github/workflows/main.yml

@@ -27,6 +27,7 @@ jobs:
               if [ "${{github.event_name}}" == "pull_request" ]; then
                 echo ::set-output name=push::false
               else
+                echo ::set-output name=push::true
                 echo ::set-output name=tags::${TAGS}
                 echo ::set-output name=branch::${GIT_BRANCH}
                 echo ::set-output name=docker_image::${DOCKER_IMAGE}