Add CI support for yak and azure publishing

[cwensley]

We should add GitHub Actions CI support to easily publish new versions of the yak package and the shared web server.

[clicketyclackety]

I think the best way to do this would be a matrix container with a custom powershell script to do the compiling so we don't need to rely on yak. I'll have a go at it. Although I know that Yak is quite finicky about which compression program is used for it. See #35

[clicketyclackety]

I eventually realised running it on one Windows container is much easier and has less hassle. But unsure if it's the perfect solution