Revert workload_identity_provider attempts

.github/workflows/deploy.yml

@@ -5,10 +5,7 @@ on:
     branches:
       - master
       - docker
-permissions:
-  id-token: write # This is required for requesting the JWT (GCloud auth)
-  contents: read  # This is required for actions/checkout
-  packages: read
+
 jobs:
   deploy:
     name: Deploy using GCloud
@@ -33,9 +30,8 @@ jobs:
         id: auth
         uses: 'google-github-actions/auth@v1'
         with:
-          project_id: ${{ vars.GCP_PROJECT_ID }}
-          workload_identity_provider: ${{ secrets.WORKLOAD_IDENTITY_PROVIDER }}
-          service_account: ${{ secrets.SERVICE_ACCOUNT }}
+          project_id: ${{ secrets.GCP_PROJECT_ID }}
+          credentials_json: '${{ secrets.GCP_SA_KEY }}'
       - name: Setup GCloud
         uses: google-github-actions/setup-gcloud@v2