👷 Use dispatch for Release CI

.github/workflows/release.yml

@@ -1,13 +1,10 @@
 name: Release CI
 on:
-  push:
-    branches:
-      - master
+  workflow_dispatch:
 jobs:
   release:
     name: Build, test, and release
     runs-on: ubuntu-18.04
-    if: "contains(github.event.head_commit.message, 'Deploy new version')"
     steps:
       - name: Checkout
         uses: actions/checkout@v2.3.4