Introduces initial draft of nightly binary publishing

[sezna]

Closes #79

See the deploy for this PR here: https://github.com/FuelLabs/sway-nightly-binaries/tree/master/nightly-2021-08-26:16:34:12-9f01b41

Summary

This PR builds x86 MacOS and x86 Linux images, makes a new folder of the format nightly-$DATETIME-$SHORT_SHA, and uploads sway-server and forc to subdirectories corresponding to the build arch on every push to master.

Other Notes

Some of our crates unfortunately do not support cross compilation. Because of this, we can only compile for targets that Github has runners for. This page has the available options for Github-hosted runners. Unless Github introduces an ARM runner, or we self host our own runners, we can only build x86 targets for now.

This PR builds and deploys x86 MacOS images and x86 Linux images. It would also be easy to add Windows, if we wanted, since Github has a runner for it. That being said, I'm not sure we want to sign up for supporting Windows.

I propose as a temporary work-around that we manually upload ARM/M1 images as needed when consumers want them. I can run the builds myself and upload them to the nightlies repo.

I also changed the cargo test stage so that it only runs if you change any .rs, .sw, or .toml files. I thought that might save us some minutes when editing yaml files and stuff.

[adlerjohn]

CI failing

[sezna]

Whoops. Fixed now. And here's the first release: https://github.com/FuelLabs/sway-nightly-binaries

Only the sway server in that one but the rest will have forc and sway-server. Anything else we should be including?

[adlerjohn]

Looks good! Two things:

1. Probably want to use time down to the seconds, to avoid multiple commits on the same day being out of order.
2. Can you also compile for arm64, and make separate directories for different archs?

[sezna]

Sounds good. How about these for now?

1. aarch64-apple-darwin
2. aarch64-unknown-linux-gnu
3. x86_64-apple-darwin
4. x86_64-unknown-linux-gnu
5. One of x86_64-pc-windows-gnu or x86_64-pc-windows-msvc. I'm not sure which is better for Windows. Do you know?

I think that's enough for now, unless you want to support riscv or mips...or power pc...

[adlerjohn]

I think we can omit Windows for now since we don't really have any way of testing it. If devs want it we can add it to our pipeline. The rest are fine.

[sezna]

Sorry for all those subscribed to this issue. The convert_to_draft github endpoint is returning a 404, and I'm going to need to do some iteration here to get the action to work. You might get spammed. I'll re-request review when it is ready.

Edit: Apparently it went through even though it 404'd. Whatever.