fix: npm output handling (#150)

* fix output handling

* chore: run black auto formatter

Co-authored-by: Alexander Betaev <[email protected]>

Author: sriram-mv

aws_lambda_builders/workflows/nodejs_npm/actions.py

@@ -56,7 +56,7 @@ def execute(self):
 
             LOG.debug("NODEJS packaging %s to %s", package_path, self.scratch_dir)
 
-            tarfile_name = self.subprocess_npm.run(["pack", "-q", package_path], cwd=self.scratch_dir)
+            tarfile_name = self.subprocess_npm.run(["pack", "-q", package_path], cwd=self.scratch_dir).splitlines()[-1]
 
             LOG.debug("NODEJS packed to %s", tarfile_name)