Setting up the echidna action

[iherman]

The repository secret has also been generated and added to the repo

[iherman]

@msporny would be good if you checked it; a second pair of eyes is always helpful...

[iherman]

I presume the PR must be merged first before it can be used. The error check error seems to be a bootstrapping problem. @msporny wdyt?

[msporny]

I presume the PR must be merged first before it can be used. The error check error seems to be a bootstrapping problem. @msporny wdyt?

The error was because the server-based ReSpec build process failed. It's probably just a transient error; if the use cases document builds locally, it's probably fine.

[jandrieu]

We're going to accept this and see if it works once the commit is pushed.

[jandrieu]

Ok. We were able to get rid of the node.js error by updating the checkout task to v4.

However, now the failures are SVG complaints about rects without width & height.

This appears to be because of empty rects <rect></rect> and improper
inside a being generated by mermaid.

Can we get respec-mermaid bumped to the latest version? I believe @msporny took care of this last time.
w3c/respec-mermaid@1d8ea48#diff-7ae45ad102eab3b6d7e7896acd08c427a9b25b346470d7bc6507b6481575d519R20 through
w3c/respec-mermaid@546baa9

Although, to be fair, we have not verified that the latest mermaid has a fix for this. I'm reviewing their issue log to see if there's anything.