Add first draft of a build pipeline

[jfversluis]

Adds a crude version of a build pipeline. Right now builds on PRs and just builds the libraries on Windows and Mac and publishes unsigned NuGets.

TODO after this and/or if someone has solutions I missed at this time:

• Make unit tests work, I couldn't seem to be able to
• Build sample apps
• We will need to add publishing signed NuGets for actual releases

[michael-hawker]

Going to try and re-trigger with close/open and see what might be going on, as I can't see connection from DevOps side even for me.

[michael-hawker]

Going to try committing an empty pipeline file into main branch if that at least makes this show up on the DevOps side.

[michael-hawker]

@jfversluis looks like there's still references in the pipeline config to the xamarin org, so you'll need to fix those:

[jfversluis]

Unit tests seem to be unable to run at this time. Added to an issue here: microsoft/vstest#2985

[michael-hawker]

Looks like the pipeline is working now! 🎉🎉🎉 That's awesome!

@jfversluis did you figure out how to setup the Release pipeline too? (At least push to the MainLatest feed?)

[jfversluis]

Looks like the pipeline is working now! 🎉🎉🎉 That's awesome!

@jfversluis did you figure out how to setup the Release pipeline too? (At least push to the MainLatest feed?)

Created the release, can't enable the continuous one though. I have been able to push a NuGet to that feed manually :) I guess we want to hold off on that daily until we figure out the version numbers

[michael-hawker]

@jfversluis I've added you as a Project Administrator in DevOps, that should hopefully allow you to fix the settings in the Release Pipeline now?