Re-fixed github actions tag handling

[david-driscoll]

So similar changes to this were provided in PR #3033 (fix for #2838) however the changes Azure Pipelines caused it to quickly be reverted (#3081, #3082, #3083). While I believe the Azure Pipelines issues were genuine, I don't believe the changes for Github Actions had any issues (that I'm aware of) however it currently causes mass headache when trying to push preview releases.

This change reintroduces only the github action changes. I suspect the changes to Gitlab and others might still apply, however I would rather they get added as separate PRs in the event that one of them triggers another revert.

Description

Updates the GitHubActions build agent to properly handle both tag builds and pull request builds based on the github actions docs.

See: https://docs.github.com/en/actions/learn-github-actions/variables#default-environment-variables

Related Issue

#2838, #3033, #3653

Motivation and Context

Today github actions cannot properly create a tagged preview build because the version comes out and some form of 1.5.0-tags-v1-5-0-preview-6.1 where the real base branch is not properly detected

How Has This Been Tested?

Changes are based off the original PR with some changes based on additional environment variables that exist in a Github Action Runner environment (event name, ref type, head ref, etc)

Screenshots (if appropriate):

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[asbjornu]

LGTM!

[mergify]

Thank you @david-driscoll for your contribution!

[arturcic]

🎉 This issue has been resolved in version 6.0.0-beta.4 🎉
The release is available on:

• GitHub Release
• Chocolatey Package
• .Net Global Tool

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