CI: build on pushes to all branches

Author: tarleb

.github/workflows/ci.yml

@@ -5,7 +5,6 @@ name: CI
 on:
   pull_request:
   push:
-    branches: [master]
     paths-ignore:
       - 'README.md'
       - 'stack.yaml'
@@ -34,10 +33,6 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-      if: >-
-        github.event.action == 'opened' ||
-        github.event.action == 'synchronize' ||
-        github.event.ref == 'refs/heads/master'
 
     - uses: haskell/actions/setup@v1
       name: Setup Haskell