chore: fix circle ci publishing

[nolanlawson]

I'm not sure why 1.1.4 was a botched release, but it looks like the dist/ files weren't copied from the test job to the deploy job. This adds an extra save_workspace which I'm hoping will fix it?

If not, I added a check that will fail if there isn't a dist/ JS file to publish. In that case, we can just publish manually.

[nolanlawson]

Alternatively, we could just rebuild the files all over again

[nolanlawson]

According to the Circle CI docs, this should have worked, so I have no idea what went wrong.

The workspace is additive only, jobs may add files to the workspace but cannot delete files from the workspace. Each job can only see content added to the workspace by the jobs that are upstream of it. When attaching a workspace the “layer” from each upstream job is applied in the order the upstream jobs appear in the workflow graph.

[nolanlawson]

Looking back, the deploy job has never run successfully.

[nolanlawson]

I think I figured it out: the package.json didn't have a prepare script, so actually we were never running yarn build anywhere in the pipeline! The test scripts could run just fine using source TS files.

I added a prepare script; 🤞 let's hope it works.