adding stderr

src/git-command-manager.ts

@@ -91,6 +91,7 @@ class GitCommandManager {
 
   async branchList(remote: boolean): Promise<string[]> {
     const result: string[] = []
+    const stderr: string[] = []
 
     // Note, this implementation uses "rev-parse --symbolic-full-name" because the output from
     // "branch --list" is more difficult when in a detached HEAD state.
@@ -106,7 +107,7 @@ class GitCommandManager {
 
     const listeners = {
       stderr: (data: Buffer) => {
-        core.debug(data.toString())
+        stderr.push(data.toString())
       }
     }
     const output = await this.execGit(args, false, false, listeners)
@@ -123,7 +124,7 @@ class GitCommandManager {
         result.push(branch)
       }
     }
-
+    core.debug(stderr.join('\n'))
     return result
   }