ci: update yml

[C-BJ]

Changes proposed in this PR:

• Rename rust.yml -> ci.yml
• Test is no longer run when the corresponding platform fails to compile
• Use cargo check rather than cargo build in build and check

@mtshiba

[mtshiba]

Why tests and builds are run independently is to reduce CI run time.

This change should basically make CI time worse (though there will be a cache effect).

[C-BJ]

I see, But I don't understand the purpose of build and check

[toddlerer]

The reason I used cargo build instead of cargo check is that cargo check does not allow for some checks(ref). I didn't leave my intentions in a comment out, so I guess I didn't get the message.

[C-BJ]

I mean, why don't we just test it? without build and check?

[mtshiba]

The advantage is that when CI fails, it is easy to see whether the build or the test has failed.

[C-BJ]

I see