rewrite ci

[figsoda]

• builds and tests in debug mode with stable
• builds in release mode and uploads stripped binaries with nightly
• uploads completions and man page on x86_64-unknown-linux-musl
• checks with clippy and rustfmt

platforms:

• x86_64-apple-darwin
• x86_64-pc-windows-msvc
• x86_64-unknown-linux-gnu
• x86_64-unknown-linux-musl

[marcospb19]

builds in release mode and uploads stripped binaries with nightly

Maybe we should upload binaries compiled with stable Rust while we don't use any proper Rust nightly feature, just the rustfmt unstable features.

This way CI can also detect if we are using nightly features.

Not that I want to block nightly, it has nice features but we would only like to depend on it if given a big reason.

[figsoda]

nightly rust supports stripping so we don't have to figure out how to strip binaries on different platforms

[marcospb19]

Ok, that's very useful 😄 merging!