Use urlsup to health check

[simeg]

I've written urlsup over the last few months. It's more robust and faster than the bash script. I wrote it to be used for this repo specifically, but can of course be used for any similar type of repo.

The downsides to using this tool over the script are

• It's harder to understand the rust code over the bash script (IMO)
• If we need changes to it I have to be involved in some way (write code/review PR and deploy new version). With the script anyone can make changes.

I do however feel that I'd like to try it, do some dogfooding to have it run on an actual project.

Let me know what you think!

[simeg]

Hmm it looks like it's not faster actually because it needs to download the image. Caching a single small image doesn't seem like a good approach.

So we don't get any speed gains but it's a daily cron job so it doesn't matter.

It currently is using the links from the health-check branch. I need to point it to the master branch.

[simeg]

Now it runs on master branch. It already found two issues (yay) that I fixed.

@hugovk Could I get an approval so I can merge this? 🙂