setup basic CI checks

[fbielejec]

• add clippy checks, fix all clippy warnings
• add toolchain file to set same rustc for all (set it to stable but happy to change)
• add fmt file with basic formatting options
• run fmt --all
• basic CI with caching, branch protection rules

[notlesh]

This would probably cause a lot of conflicts with #9, could we run this once that is merged?

[fbielejec]

This would probably cause a lot of conflicts with #9, could we run this once that is merged?

You could just format that PR after a merge and resolve to yours?

[fbielejec]

I created a basic action together with branch protection rules but I cannot set them, as we have a private repo on a free plan:

The easiest would be to just turn it public, are there any reasons to keep it hidden @JoshOrndorff @notlesh WYT?

[JoshOrndorff]

Excellent thank you!

Regarding making the repo public, I fully support it. I am actively advocating for making the entire academy content public. I haven't yet succeeded in convincing the admins to do that, so I guess it is up to @nukemandan to decide if we can make this repo public.

There is really nothing private in here at all. There aren't even instructions for what we will do in class. It is just a Substrate node. So I hope we can open it.

In any case, feel free to merge this when you are ready.

[JoshOrndorff]

Yeah, let's not hold this up. I can own the process of resolving it with #9.

[fbielejec]

Yeah, let's not hold this up. I can own the process of resolving it with #9.

you have my axe if help needed. ok merging