Update GitHub Actions to trigger on pull requests and update go version (#185)

Author: ssagarverma

.github/workflows/go-tests.yml

@@ -1,6 +1,8 @@
 name: go-tests
 
-on: [push]
+on:
+  pull_request:
+    branches: [ main ]
 
 env:
   TEST_RESULTS: /tmp/test-results
@@ -11,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go-version: [ 1.15.3, 1.19 ]
+        go-version: ['stable', 'oldstable']
 
     steps:
       - name: Setup go