Scope deploys to main, gcloud branches; shorten initial delay

.github/workflows/push.yml

@@ -2,6 +2,9 @@ name: CI
 
 on:
   push:
+    branches:
+      - main
+      - gcloud
 
 env:
   PROJECT_ID: zealous-zebra
@@ -71,16 +74,11 @@ jobs:
 
     # Deploy managed instance group using the new instance template
     - name: Deploy managed instance group
-      # Assumes the 'zebrad-tracing-filter' healthcheck to hit
-      # :3000/filter exists, which requires the
-      # 'allow-tracing-health-check' firewall rule to allow Google
-      # 'spotter' IPs to hit that port be added to the network
-      # attached to the instance template (usually it's 'default').
       run: |
         gcloud compute instance-groups managed create \
           "zebrad-$SHORT_BRANCH_NAME-$SHA7" \
           --template "zebrad-$SHORT_BRANCH_NAME-$SHA7" \
           --health-check zebrad-tracing-filter \
-          --initial-delay 60 \
+          --initial-delay 30 \
           --region us-central1 \
           --size 2