build(electron): allow customizing channel type for internal build (#4511)

.github/workflows/nightly-build.yml

@@ -2,6 +2,15 @@ name: Build Canary Desktop App on Staging Branch
 
 on:
   workflow_dispatch:
+    inputs:
+      channel_override:
+        description: 'channel type (canary, beta, or stable)'
+        type: choice
+        default: beta
+        options:
+          - canary
+          - beta
+          - stable
   push:
     branches:
       # 0.6.x-staging
@@ -27,7 +36,10 @@ concurrency:
   cancel-in-progress: true
 
 env:
+  # BUILD_TYPE => app icon, app name, etc
   BUILD_TYPE: internal
+  # BUILD_TYPE_OVERRIDE => channel type (canary, beta, or stable) - get the channel type (the api configs)
+  BUILD_TYPE_OVERRIDE: ${{ github.event.inputs.channel_override || 'beta' }}
 
 jobs:
   set-build-version: