ci: Update release workflow to support manual dispatch trigger

- Replace branch-based trigger with `workflow_dispatch`.
- Simplifies triggering releases manually when needed.

Author: TriPSs

.github/workflows/release.yml

@@ -1,9 +1,7 @@
 name: Release
 
 on:
-  push:
-    branches:
-      - master
+  workflow_dispatch:
 
 env:
   NX_BRANCH: ${{ github.event.number }}