Add release type input to release action

.github/workflows/release.yml

@@ -2,9 +2,20 @@ name: Release
 
 on:
   workflow_dispatch:
+    inputs:
+      requested_release_type:
+        description: 'Release type (may be overridden by commit messages, see mathieudutour/github-tag-action)'
+        required: true
+        default: 'patch'
+        type: choice
+        options:
+          - patch
+          - minor
+          - major
 
 jobs:
   build:
+    if: github.ref_name == github.event.repository.default_branch
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1
@@ -13,6 +24,7 @@ jobs:
       id: tag_version
       uses: mathieudutour/github-tag-action@d745f2e74aaf1ee82e747b181f7a0967978abee0
       with:
+        default_bump: ${{ github.event.inputs.requested_release_type }}
         github_token: ${{ secrets.GITHUB_TOKEN }}
         release_branches: .*