CI: don't run everything twice in PRs (#616)

* ci: don't run everything twice in PRs

Runs CI only for push on master, to get CI feedback on branches, please open a draft PR
* Update .github/workflows/ci.yml

Co-authored-by: Norman Rzepka <[email protected]>

Author: jstriebel

.github/workflows/ci.yml

@@ -1,6 +1,10 @@
 name: CI
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+    - master
+  pull_request: {}
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}