ci: trigger homebrew job only when publish was finished

Author: woile

.github/workflows/homebrewpublish.yaml

@@ -1,12 +1,15 @@
 name: Publish to Homebrew
 
 on:
-  push:
-    tags:
-      - 'v*'
+  workflow_run:
+    workflows: ["Upload Python Package"]
+    types:
+      - completed
+
 jobs:
   deploy:
     runs-on: ubuntu-latest
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
     steps:
     - name: Checkout
       uses: actions/checkout@v2