Switch to using GitHub Actions for CI

[robyoung]

I have tried to keep it functionally identical to the travis workflow. This is a bit tricky for me to test.

There are some minor changes though.

• Added MSRV of 1.51.0 - I just picked a version out of thin air here.
• I could not see an easy way of preventing master branch runs for PRs that have passed so this should run on all.
• For deploying to github pages I'm using a 3rd party action. It looks reasonable and just uses the default repo scoped token.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @andre-richter (or someone else) soon.

Please see the contribution instructions for more information.

[robyoung]

That's great. Thanks for the review. I'll take a look at it later today.

[robyoung]

@adamgreig I have tried to follow the other book repos as much as possible. However, it looks like this repo does a bit more testing so it feels like it needs to be tested across different versions of rust, which the other workflows do not.

[bors[bot]]

Canceled.

[adamgreig]

Ugh, that's enough whack-a-mole for tonight. Please don't be put off, this is mostly the test script needing some updates for the latest version of nm. The usual game of fixing one CI bug and then finding the next... If you can work out why arm-none-eabi-gcc isn't being found even though it's apparently installed please go ahead, but otherwise I'll try again tomorrow.

[adamgreig]

Whew, that was an endeavour. It turns out you can't copy arm-none-eabi-gcc into a new directory, it needs to stay relative to the directory structure it was extracted from. Who knew.

bors merge

[bors[bot]]

:-1: Rejected by too few approved reviews

[adamgreig]

bors cancel

[bors[bot]]

Canceled.

[bors[bot]]

Build succeeded:

• build (1.51.0)
• build (stable)

[adamgreig]

:tada: thanks @robyoung!

[robyoung]

Woop! Thank you for fixing it. I was totally stumped.