[github-actions] checkout@v2 allows simpler branch name extraction

Author: Ronny Wegener

build-web.js

@@ -64,12 +64,7 @@ async function polymerBuild(settings) {
 }
 
 async function createVersionInfo(file) {
-    let branch = undefined;
-    // GitHub actions checkout the commit in a detached HEAD state => try to get branch from GitHub environment variable
-    if(process.env.GITHUB_REF) {
-        process.env.GITHUB_REF.split('/').pop();
-    }
-    branch = branch || (await execute(`git rev-parse --abbrev-ref HEAD`)).trim();
+    let branch = /*process.env.GITHUB_REF ? process.env.GITHUB_REF.split('/').pop() : */(await execute(`git rev-parse --abbrev-ref HEAD`)).trim();
     let revision = (await execute(`git rev-parse HEAD`)).trim();
     let content = [
         `export default {`,