[Bug] GenerateBuildLogOutput for Github actions uses deprecated set-env command

[danielmarbach]

Describe the bug

GitHub Actions is deprecating set-env and add-path commands as outlined by

https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/

Therefore starting from version 2.273.5 of the runner GenerateBuildLogOutput outputs

Environment files should be used instead

https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-commands-for-github-actions#environment-files

Expected Behavior

Use env files to not trigger the warning

Actual Behavior

Possible Fix

See PR

Steps to Reproduce

Run a build with GitVersion using GitHub actions

Context

Your Environment

• Version Used:
• Operating System and version (Windows 10, Ubuntu 18.04):
• Link to your project:
• Link to your CI build (if appropriate):

[arturcic]

🎉 This issue has been resolved in version 5.5.0 🎉
The release is available on:

• GitHub Release
• Chocolatey Package
• .Net Global Tool

Your GitReleaseManager bot 📦🚀