try using git for deployment

Author: chriswedgwood

.github/workflows/heroku-deploy.yml

@@ -25,8 +25,8 @@ jobs:
     - name: Build and push
       env:
         HEROKU_API_KEY: ${{ secrets.HEROKU_API_KEY }}
-      run: heroku container:push -a djangosnippets web 
+      run: heroku git:remote -a djangosnippets  
     - name: Release
       env:
         HEROKU_API_KEY: ${{ secrets.HEROKU_API_KEY }}
-      run: heroku container:release -a djangosnippets web 
+      run: git push heroku main