Oneliner to set signer version at compile time with STACKS_NODE_VERSION

[wileyj]

ref #5002

This is the minimally viable change to allow setting the signer version at build time, defaulting to CARGO_PKG_VERSION.
Since the signer already uses the same build process as stacks-core, the correct version will already be set as STACKS_NODE_VERSION, so that is why that env var is used here vs something more suited like SIGNER_VERSION.
using SIGNER_VERSION would simply require some downstream changes (mainly to CI workflows), but is trivial if that env var is desired.

I did set out to try and expose a version string like /v2/info, but due to how Clap was expecting a str, i wasn't able to get all the desired values returned correctly.

~/stacks-core$ cargo run --bin stacks-signer -- --version
warning: /home/wileyj/stacks-core/testnet/stacks-node/Cargo.toml: `default_features` is deprecated in favor of `default-features` and will not work in the 2024 edition
(in the `reqwest` dependency)
   Compiling stacks-signer v0.0.1 (/home/wileyj/stacks-core/stacks-signer)
    Finished `dev` profile [optimized + debuginfo] target(s) in 5.22s
     Running `target/debug/stacks-signer --version`
stacks-signer 0.0.1

~/stacks-core$ STACKS_NODE_VERSION=2.5.0.0.5.1 cargo run --bin stacks-signer -- --version
warning: /home/wileyj/stacks-core/testnet/stacks-node/Cargo.toml: `default_features` is deprecated in favor of `default-features` and will not work in the 2024 edition
(in the `reqwest` dependency)
   Compiling stackslib v0.0.1 (/home/wileyj/stacks-core/stackslib)
   Compiling libsigner v0.0.1 (/home/wileyj/stacks-core/libsigner)
   Compiling stacks-signer v0.0.1 (/home/wileyj/stacks-core/stacks-signer)
    Finished `dev` profile [optimized + debuginfo] target(s) in 11.66s
     Running `target/debug/stacks-signer --version`
stacks-signer 2.5.0.0.5.1

this is what i tried to emulate /v2/info with, but wasn't able to figure out how to return the full output as a str:

const GIT_BRANCH: Option<&'static str> = option_env!("GIT_BRANCH");
const GIT_COMMIT: Option<&'static str> = option_env!("GIT_COMMIT");
#[cfg(debug_assertions)]
const BUILD_TYPE: &'static str = "debug";
#[cfg(not(debug_assertions))]
const BUILD_TYPE: &'static str = "release";
fn version_string<'life>() -> &'life str {
    let pkg_version = option_env!("STACKS_NODE_VERSION").unwrap_or(env!("CARGO_PKG_VERSION"));
    let git_branch = GIT_BRANCH.unwrap_or("");
    let git_commit = GIT_COMMIT.unwrap_or("");
    let formatted = format!(
        "{} ({}:{}, {} build, {} [{}])",
        pkg_version,
        git_branch,
        git_commit,
        BUILD_TYPE,
        std::env::consts::OS,
        std::env::consts::ARCH
    );
    println!("formatted= {}", formatted);
    return formatted;
}

formatted prints the expected output:

formatted= 2.5.0.0.5.1 (release/signer-2.5.0.0.1:56eec5912, debug build, linux [x86_64])

but Clap is expecting it to be a str.

[wileyj]

with @ASuciuX help, we found a way to return the desired version output in the format that Clap was expecting.

[obycode]

🙌

[blockstack-devops]

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