github: Attempt to run workflow test at every push and PR.

.github/workflows/rust-build.yml

@@ -1,10 +1,6 @@
 name: Build and Test
 
-on:
-    push:
-        branches:
-            - master
-        pull_request:
+on: [push, pull_request]
 
 jobs:
     compile-and-test: