feat: add Github Actions environment variable to isPullRequest method (#7152)

Author: kuidaoring

.changeset/chilled-items-fail.md

@@ -0,0 +1,5 @@
+---
+"builder-util": patch
+---
+
+feat: add Github Actions environment variable to isPullRequest method to detect if build is a PR

packages/builder-util/src/util.ts

@@ -327,7 +327,11 @@ export function isPullRequest() {
   }
 
   return (
-    isSet(process.env.TRAVIS_PULL_REQUEST) || isSet(process.env.CIRCLE_PULL_REQUEST) || isSet(process.env.BITRISE_PULL_REQUEST) || isSet(process.env.APPVEYOR_PULL_REQUEST_NUMBER)
+    isSet(process.env.TRAVIS_PULL_REQUEST) ||
+    isSet(process.env.CIRCLE_PULL_REQUEST) ||
+    isSet(process.env.BITRISE_PULL_REQUEST) ||
+    isSet(process.env.APPVEYOR_PULL_REQUEST_NUMBER) ||
+    isSet(process.env.GITHUB_BASE_REF)
   )
 }