Enable deployments from 'production' branch push, add tag field for rollbacks to git sha

.github/workflows/docker-publish.yml

@@ -2,7 +2,7 @@ name: Publish Docker Image to GCR
 
 on:
   push:
-    branches: [main, master]
+    branches: [main, master, production]
   workflow_call:
     secrets:
       GCR_PROJECT:

.github/workflows/fly-deploy.yml

@@ -2,6 +2,20 @@ name: Deploy to Fly
 
 on: workflow_dispatch
 
+on:
+  workflow_run:
+      workflows: ["Publish Docker Image to GCR"]
+      branches: [production]
+      types: 
+        - completed
+  workflow_dispatch:
+    inputs:
+        imageTag:
+          description: 'Docker Image Tag'
+          required: true
+          type: string
+          default: 'latest'
+
 env:
   FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}