trigger on both push and pull requests...

and trigger on any branch, not just master

.github/workflows/main.yml

@@ -1,12 +1,10 @@
 # This is a workflow to build the AST Explorer application
 
-name: Build.Socratex
+name: Build.Explorer
 
 # Controls when the action will run. Triggers the workflow on push or pull request
-# events but only for the master branch
-on:
-  push:
-    branches: [ master ]
+# events for any branch.
+on: [push, pull_request]
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs: