problem: GCP auth migrated to a separate action and doesn't work the old way

.github/workflows/artifacts.yaml

@@ -1,13 +1,11 @@
 name: Artifacts
 
 on:
-  # if pushed directly
   push:
     branches:
       - master
       - release/*
       - ci/*
-  # on a pull request
   pull_request:
     branches:
       - master
@@ -18,6 +16,7 @@ jobs:
 
   publish-gcp:
     runs-on: ubuntu-latest
+
     steps:
       - name: Checkout the code
         uses: actions/checkout@v2
@@ -27,12 +26,13 @@ jobs:
         with:
           java-version: 13
 
+      - name: Auth GCP
+        uses: google-github-actions/auth@v0
+        with:
+          credentials_json: ${{ secrets.GCP_ARTIFACTS_KEY }}
+
       - name: Setup GCP
         uses: google-github-actions/setup-gcloud@v0
-        with:
-          project_id: ${{ secrets.GCP_PROJECT_ID }}
-          service_account_key: ${{ secrets.GCP_ARTIFACTS_KEY }}
-          export_default_credentials: true
 
         # needed for GitVersion
       - name: Fetch all history