Add missing pull_request id env variable

[armano2]

I did small refactoring of code as everything was typed there 4 times

cc @drazisil @ibrahim0814
fixes #52

[ibrahim0814]

Hi @armano2! Thank you for taking the time to make this pull request! Unfortunately, the changes you made need to be reflected on our bash uploader instead of in this repository. I've made a similar PR on our bash uploader that fixes incorrect PR handling for GitHub Actions here: codecov/codecov-bash#263

For this repository, the only change that needs to be made is to add the GITHUB_HEAD_REF environment variable if it exists.

[ibrahim0814]

See comment above

[armano2]

ok i will update PR, thank you for feedback

[armano2]

@ibrahim0814 updated, i'm unsure why ncc outputs packages in different order in dist

[ibrahim0814]

Going to be adding a few commits to your changes here @armano2! Currently removing the yml parameter since we're having a ton of issues with yaml validation on our end. Nothing to do with your changes but thought I'd roll it in together since I want to release a new version of this action soon

[ibrahim0814]

Will also be adding in documentation and code to accommodate tokenless functionality for Actions in this PR