fix: Output path to local results github action

[piotradamczyk5]

As you can see for example in this run, output contains file name:

Local directory: /home/runner/work/flank-github-action-testing/flank-github-action-testing/results/2021-03-11_15-13-11.697000_GzOA/android_shards.json
Gcloud: https://console.developers.google.com/storage/browser/test-lab-v9cn46bb990nx-kz69ymd4nm9aq/2021-03-11_15-13-11.697000_GzOA

but it should be:

Local directory: /home/runner/work/flank-github-action-testing/flank-github-action-testing/results/2021-03-11_15-13-11.697000_GzOA
Gcloud: https://console.developers.google.com/storage/browser/test-lab-v9cn46bb990nx-kz69ymd4nm9aq/2021-03-11_15-13-11.697000_GzOA

This is a quick workaround to avoid making a new Flank release, when we will fix this on Flank side, it should be removed from Flank github action

Test Plan

How do we know the code works?

There should not be a file name at the end

Locally:

1. Create file flank-links.log with path to some file as a content
2. run command file_path=$(find -name "flank-links.log")
3. then local_directory_file=$(sed -n '1p' < $file_path)
4. at the end echo results echo $(dirname $local_directory_file)

Github action:
Should return local path without file name at the end

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[github-actions]

Timestamp: 2021-03-11 15:41:09
Buildscan url for ubuntu-workflow run 643274041
https://gradle.com/s/rprlzxgybyd7q