Use secrets for GCP authentication parameters

- Change to use GCP_WORKLOAD_IDENTITY_PROVIDER secret
- Change to use GCP_SERVICE_ACCOUNT secret
- Provides centralized configuration management

Author: amrit110

.github/workflows/deploy-catalog-gcp.yml

@@ -79,8 +79,8 @@ jobs:
       - name: Authenticate to Google Cloud
         uses: google-github-actions/auth@v2
         with:
-          workload_identity_provider: 'projects/736624225747/locations/global/workloadIdentityPools/github-actions-pool/providers/github-provider'
-          service_account: '[email protected]'
+          workload_identity_provider: ${{ secrets.GCP_WORKLOAD_IDENTITY_PROVIDER }}
+          service_account: ${{ secrets.GCP_SERVICE_ACCOUNT }}
 
       - name: Set up Cloud SDK
         uses: google-github-actions/setup-gcloud@v2