adjust workflow to use var instead of secret

Author: lukaskratzel

.github/workflows/python-package.yml

@@ -50,7 +50,7 @@ jobs:
       env:
         CORBADO_PROJECT_ID: ${{ secrets.CORBADO_PROJECT_ID }}
         CORBADO_API_SECRET: ${{ secrets.CORBADO_API_SECRET }}
-        CORBADO_FRONTEND_API: ${{ secrets.CORBADO_FRONTEND_API }}
+        CORBADO_FRONTEND_API: ${{ vars.CORBADO_FRONTEND_API }}
         CORBADO_BACKEND_API: ${{ vars.CORBADO_BACKEND_API }}