Replace Azure Pipelines with Github Actions

[quentinlesceller]

As titled. This PR replaces Azure Pipelines (AP) with Github Actions (GA). Pros:

• GA does not require a microsoft account.
• GA is way more simple and robust.
• GA is well integrated with Github.

Cons: ?

As of today it does exactly the same as what we have:

• Tests all linux packages separately.
• Runs cargo test --release --all on macOS and Windows.
• Handles release including binaries, changelog and shasum. Example here https://github.com/quentinlesceller/grin-wallet/releases/tag/v5.2.0-test.1
• One caveat is that we can produce a release even if the tests are not passing. But that would be extremely strange to push a tag if our tests are not working.

To test:

• [x] Windows Release (Waiting for #685 to be merged). Tested and working.

If this is merged I intend to switch grin repo to Github Actions as well.

Also binaries arch are renamed to x86_64 instead of amd64 to avoid confusion with arm64.

[yeastplume]

That's really great to see, thanks. I was thinking that our build infrastructure could use a revision to see where we might be able to improve 👍

[quentinlesceller]

Is there anything else that you'd like in the build infrastructure?

[yeastplume]

Let me have a think and come back to you - thanks!

[yeastplume]

Are we okay to merge this? Would like to give it a go with a beta release

[quentinlesceller]

Sure. Let's do this.