fix: Update workload identity provider and add service account for authentication

Author: ChingEnLin

.github/workflows/google-cloudrun-docker.yml

@@ -15,7 +15,7 @@ env:
   REGION: 'europe-west1'
   BACKEND_SERVICE: 'querypal-backend'
   FRONTEND_SERVICE: 'querypal-frontend'
-  WORKLOAD_IDENTITY_PROVIDER: 'projects/gen-lang-client-0698668474/locations/global/workloadIdentityPools/github-actions-pool/providers/github-provider'
+  WORKLOAD_IDENTITY_PROVIDER: 'projects/874216619692/locations/global/workloadIdentityPools/github/providers/querypal'
 
 jobs:
   deploy:
@@ -35,6 +35,7 @@ jobs:
         uses: 'google-github-actions/auth@f112390a2df9932162083945e46d439060d66ec2' # google-github-actions/auth@v2
         with:
           workload_identity_provider: '${{ env.WORKLOAD_IDENTITY_PROVIDER }}'
+          service_account: 'github-actions@gen-lang-client-0698668474.iam.gserviceaccount.com'
 
       # BEGIN - Docker auth and build
       - name: 'Docker Auth'