Warning related to "set-output" being depricated on ci

[NiharR027]

Thank you for this package 🙏

When the job does Run thomaseizinger/[email protected]

I saw this on the ci:

Warning: The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
Warning: The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
Warning: The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
Warning: The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

It printed this 4 times.

From looking at the code, I think the error is coming out from this file: https://github.com/thomaseizinger/create-release/blob/master/src/index.ts

Specifically where it does:

setOutput('id', releaseId.toString());
setOutput('url', url);
setOutput('html_url', htmlUrl);
setOutput('upload_url', uploadUrl);

Hence the ci prints 4 warnings, i.e. 1 time for each setOutput.

I tried to do some research and found an open issue about this: actions/toolkit#1218 (maybe that's related and we can find some solution from there?)

[thomaseizinger]

Fixed in #7.