ci: don't run ci on push to main (#215)

No run on main

Author: kafkas

.github/workflows/ci.yml

@@ -1,9 +1,8 @@
 name: CI
 
 on:
-  push:
-    branches: [main]
   pull_request:
+  workflow_dispatch:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}