fix: update deploy.yaml trigger to be upon release publish, instead of merges to the release branch

Author: clairep94

.github/workflows/deploy.yml

@@ -1,11 +1,8 @@
 name: Deploy to production
 on:
-  workflow_run:
-    workflows: ["Test"]
-    branches:
-      - release
+  release:
     types:
-      - completed
+      - published
 env:
   PROJECT_ID: ${{ secrets.GKE_PROJECT }}
   GKE_CLUSTER: p5-gke-cluster
@@ -21,7 +18,7 @@ jobs:
       - name: Check out the repo
         uses: actions/checkout@v3
         with:
-          ref: release
+          ref: ${{ github.event.release.tag_name }}
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
         with: