Fix Pull Request compatibility for branch detection

Author: ishland

.github/workflows/build.yml

@@ -29,11 +29,6 @@ jobs:
       fail-fast: false
 
     steps:
-    - name: Cancel Previous Runs
-      uses: styfle/[email protected]
-      with:
-        access_token: ${{ github.token }}
-        
     - uses: actions/checkout@v2
     - name: Set up JDK ${{ matrix.java }}
       uses: actions/setup-java@v1

build.gradle.kts

@@ -11,8 +11,8 @@ toothpick {
         ?: "\"${gitCmd("rev-parse", "--short", "HEAD").output}\""
     if(!System.getenv("BRANCH_NAME").isNullOrEmpty()) {
         currentBranch = System.getenv("BRANCH_NAME")
-    } else if (!System.getenv("GITHUB_HEAD_REF").isNullOrEmpty()) {
-        currentBranch = System.getenv("GITHUB_HEAD_REF")
+    } else if (!System.getenv("GITHUB_BASE_REF").isNullOrEmpty()) {
+        currentBranch = System.getenv("GITHUB_BASE_REF")
     } else if (!System.getenv("GITHUB_REF").isNullOrEmpty()) {
         currentBranch = System.getenv("GITHUB_REF").substring("refs/heads/".length)
     } else {