ci(release): support main during production branch rename

Run production builds and changelog generation from both v4.x and main while excluding both branches from staging builds.

.github/workflows/coolify-sha-build.yml

@@ -2,7 +2,7 @@ name: Build Coolify (SHA)
 
 on:
   push:
-    branches: ["v4.x"]
+    branches: ["v4.x", "main"]
 
 permissions:
   contents: read