Set correct relative path

 "every action and every plugin's code runs in the root of the project, while all user code from the Fastfile runs inside the ./fastlane directory." https://docs.fastlane.tools/advanced/fastlane/\#directory-behavior

fastlane/lanes/test.rb

@@ -22,7 +22,7 @@
       gradle(task: "runFlank#{app.to_s.capitalize}")
       sh("buildkite-agent annotation remove --context '#{annotation_ctx}' || true") if is_ci?
     rescue
-      details_url = sh('jq ".[].webLink" build/instrumented-tests/matrix_ids.json -r')
+      details_url = sh('jq ".[].webLink" ../build/instrumented-tests/matrix_ids.json -r')
       message = "Firebase Tests failed. Failure details can be seen [here in Firebase Console](#{details_url})"
       sh('buildkite-agent', 'annotate', message, '--style', 'error', '--context', annotation_ctx) if is_ci?
       UI.test_failure!(message)