Fix CI

[DeeDeeG]

I turned on GitHub Actions for this repository and checked if it was still working after all these months.

It was not.

This branch adds some workarounds/fixes/updates so there can be (passing) CI at this repo again!

[DeeDeeG]

So, the Windows workaround (a7ab301) is for an intermittent issue.

And installing an extra temporary copy of node-gyp like this just to fetch the headers (npx node-gyp install) is slow (1 minute and 15 seconds out of a 4 minute 50 second total run. Yikes.)

We can consider not including this workaround and just being willing to re-run failed jobs on the occasions where the race condition causes the build to fail. Or perhaps use something like nick-fields/retry action on the "install dependencies" step, maybe for Windows only.

We could also do npm install -g npm@latest (newer npm = newer node-gyp, where the issue is fixed). This might be a tad slow in and of itself, though.

I dunno. Anyway, doing the workaround as I did it here is reliable but slow. Just a fair warning or heads-up and opening for discussion if people prefer we deal with it another way.

[confused-Techie]

Looks great to me. The additions here are relatively standard stuff when compared to the GitHub Actions on the main Pulsar repo, so I see no issues here.

Lets go ahead and get this one merged!