ci: run release workflow on next branch (#315)

Author: mcous

.github/workflows/release.yml

@@ -2,9 +2,9 @@ name: CI
 
 on:
   push:
-    branches: [main]
+    branches: [main, next]
   pull_request:
-    branches: [main]
+    branches: [main, next]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}