Fix CI to only run on branches, not tags

Author: zyv

.github/workflows/ci.yml

@@ -1,11 +1,18 @@
 name: CI
-on: [ push, pull_request ]
+
+on:
+  push:
+    branches:
+      - "**"
+  pull_request:
 
 jobs:
   lint-and-test:
-    if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
     runs-on: ubuntu-latest
     timeout-minutes: 5
+
+    if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
+
     strategy:
       fail-fast: false
       matrix: