Merge pull request #510 from microsoft/ci/release-please-dispatch

ci: adds workflow dispatch to release please

Author: baywet

.github/workflows/release-please-gha.yml

@@ -14,7 +14,7 @@ on:
   push:
     branches:
       - main
-
+  workflow_dispatch:
 
 permissions:
   contents: read
@@ -37,4 +37,4 @@ jobs:
         with:
           token: ${{ steps.app-token.outputs.token }}
           config-file: release-please-config.json
-          manifest-file: .release-please-manifest.json
+          manifest-file: .release-please-manifest.json