ci: run tests on PR (#651)

Author: the-chris-mitchell

.github/workflows/build-test-lint.yml

@@ -2,6 +2,10 @@ name: Dotnet Build, Lint and Test
 
 on:
     push:
+        branches:
+          - master
+    pull_request:
+        types: [opened, reopened, synchronize]
 
 jobs:
     build-test-lint:
@@ -46,4 +50,4 @@ jobs:
             - name: Stop PRISM
               if: success() || failure()
               run: pkill -f prism
-              working-directory: Xero-NetStandard
+              working-directory: Xero-NetStandard