Enforce permissions

.github/workflows/build.yml

@@ -12,6 +12,8 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
     - uses: actions/checkout@v2.4.0
     - name: Set up Ruby
@@ -28,4 +30,3 @@ jobs:
         git add -A
         git commit -m "Update plugin count" || exit 0
         git push      
-