netscape-go: run build-and-test workflow on the main branch

Signed-off-by: VirtualTam <[email protected]>

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

@@ -4,7 +4,7 @@ name: build-and-test
 on:
   push:
     branches:
-      - $default-branch
+      - main
     tags:
       - v*
   pull_request: {}