ci: Build and Test each master commit, do not cancel due to concurrency

Author: krystofwoldrich

.github/workflows/build.yml

@@ -13,7 +13,7 @@ env:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
+  cancel-in-progress: ${{ github.ref != 'refs/heads/master' }}
 
 jobs:
   build-android: