Fix build.yml

Author: tomblachut

.github/workflows/build.yml

@@ -17,7 +17,7 @@ name: Build
 on:
   # Trigger the workflow on pushes to only the 'main' branch (this avoids duplicate checks being run e.g. for dependabot pull requests)
   push:
-    branches: [main]
+    branches: [master]
   # Trigger the workflow on any pull request
   pull_request: