Automatically run release tests on liboqs release candidates

[SWilson4]

This PR proposes a release test workflow which can be triggered by repository_dispatch events. For example, with a corresponding PR in liboqs, we could trigger these workflows to run automatically on release candidates.

For a proof-of-concept, see https://github.com/SWilson4/cicd-playground-upstream and https://github.com/SWilson4/cicd-playground-downstream.

[baentsch]

Thanks for this proposal: Smart. Conceptually LGTM/I get the logic -- but the changes in release-test.sh appear to prohibit the use of the script standalone (wreaking havoc on the local github setup). But then again, this CI logic should eliminate the need/desire to run the script locally, so I think I'd be OK with the if/when you mark it Ready for Review -- assuming we also activate the matching upstream trigger-logic so this is always done during release.

[SWilson4]

Thanks for this proposal: Smart. Conceptually LGTM/I get the logic -- but the changes in release-test.sh appear to prohibit the use of the script standalone (wreaking havoc on the local github setup). But then again, this CI logic should eliminate the need/desire to run the script locally, so I think I'd be OK with the if/when you mark it Ready for Review -- assuming we also activate the matching upstream trigger-logic so this is always done during release.

I've renamed the script release-test-ci.sh and added a wrapper around it in release-test.sh so it can be used locally, just in case.

[SWilson4]

Upstream PR to trigger this: open-quantum-safe/liboqs#1654.

[baentsch]

Very nice logic -- particularly the local execution wrapper: Thanks!

[SWilson4]

@baentsch I've edited the wiki to reflect the now (hopefully) streamlined release process. Please take a look and make any edits you see fit :)

[baentsch]

I've edited the wiki

Perfect. Should the "...-tracker mechanism" turn out to work well, we may also change wording in https://github.com/open-quantum-safe/liboqs/blob/main/.github/pull_request_template.md (demanding such branches to be present in relevant subprojects).