release-drafter: On workflow_dispatch instead of workflow_call (#70)

Author: tangrufus

.github/workflows/release-drafter.yml

@@ -1,10 +1,10 @@
 name: Release Drafter
 
 on:
+  workflow_dispatch:
   push:
     branches:
       - main
-  workflow_call:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref_name }}