Fix git push by using it properly, ref: https://github.com/bitwarden/devops/blob/main/.github/workflows/_update_ephemeral_tags.yml#L58-L63 (#377)

.github/workflows/_ephemeral_environment_manager.yml

@@ -70,7 +70,7 @@ jobs:
         run: |
           if ! git rev-parse --verify origin/${{ env.BRANCH_NAME }}; then
             git checkout -b ${{ env.BRANCH_NAME }}
-            git push  
+            git push origin ${{ env.BRANCH_NAME }}
           fi
 
   cleanup: