[CI] Re-enable link checker

[devkabiir]

As part of #398, the link checker workflow was disabled for exercises.

@Stargator may have more insights as to why that change was made & whether it should be fixed or kept as is.

This issue tracks that change.

[kytrinyx]

We could try enabling it in a PR to see what breaks.

[Stargator]

The link checker or Links workflow was disabled due to a bug that caused it not to handle mailto links properly.

So it would fail every time if a file that contained a mailto was modified.

I checked the repo for the underlying library and no new releases since 0.10.1, which is what we currently use.

[kytrinyx]

Got it! Thanks for checking.

[kytrinyx]

We're looking to add a link checker to problem-specifications as well. This is the PR: exercism/problem-specifications#2145

Once that one is resolved we'll likely have a way forward in this repository as well.

[Stargator]

lynchee is pretty useful. But I'm not tied to it. Feel free to do a manual run of our Link workflow to ensure it still fails at mailto link, which lynchee should support.

[Stargator]

@kytrinyx Since the lychee action was just updated, I re-ran the workflow and it's still failing for mailto.

[Stargator]

This is the related issue at lychee

[kytrinyx]

Thank you for checking, @Stargator.

[mre]

Fix is here: lycheeverse/lychee#809.
Would be thankful if you could take a look and maybe test it locally to see if this resolves the problem.

[mre]

New version of lychee-action with the fix is out.

[Stargator]

Thanks, @mre!

I re-enabled the workflow, it's passing. So I'm leaving in en-enabled.