Revert "ci: use latest image during prod deploy" (#576)

Author: saihaj

.github/workflows/ci-cd-production.yml

@@ -61,7 +61,7 @@ jobs:
           location: us-central1-a
 
       - name: Set a new k8s image and apply the manifests
-        run: .github/scripts/kustomize-apply.sh production $APP_NAME=$BASE_IMAGE:latest
+        run: .github/scripts/kustomize-apply.sh production $APP_NAME=$BASE_IMAGE:$GITHUB_SHA
 
       - name: Wait for pods to be ready
         run: .github/scripts/kubectl-wait-ready.sh $APP_NAME