Log validator version on startup (#390)

See #374 by
@lucacillario

<!-- greptile_comment -->

## Greptile Summary

Added version logging on validator startup with both Cargo package
version and Git version information, along with minor string formatting
improvements.

- Added `git-version` dependency in `test-bins/Cargo.toml` for Git
metadata tracking
- Introduced `GIT_VERSION` constant using `git_version::git_version!()`
macro in `test-bins/src/rpc.rs`
- Enhanced startup logging to display version information for better
observability
- Updated string formatting in `magicblock-metrics/src/metrics/types.rs`
to use modern string interpolation syntax



<!-- /greptile_comment -->

---------

Co-authored-by: Luca Cillario <luca.cillario.95@gmail.com>
Co-authored-by: Luca Cillario <luca@magicblock.gg>

Author: 3 people

Cargo.lock

@@ -16,8 +16,8 @@ impl fmt::Display for Outcome {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         use Outcome::*;
         match self {
-            Success => write!(f, "{}", OUTCOME_SUCCESS),
-            Error => write!(f, "{}", OUTCOME_ERROR),
+            Success => write!(f, "{OUTCOME_SUCCESS}"),
+            Error => write!(f, "{OUTCOME_ERROR}"),
         }
     }
 }

magicblock-metrics/src/metrics/types.rs

@@ -17,6 +17,7 @@ magicblock-config = { workspace = true }
 solana-sdk = { workspace = true }
 test-tools = { workspace = true }
 tokio = { workspace = true, features = ["rt-multi-thread"] }
+git-version = { workspace = true }
 
 [[bin]]
 name = "rpc"

test-bins/Cargo.toml

@@ -16,6 +16,8 @@ const TEST_KEYPAIR_BYTES: [u8; 64] = [
     202, 240, 105, 168, 157, 64, 233, 249, 100, 104, 210, 41, 83, 87,
 ];
 
+const GIT_VERSION: &str = git_version::git_version!();
+
 fn init_logger() {
     if let Ok(style) = std::env::var("RUST_LOG_STYLE") {
         use std::io::Write;
@@ -99,6 +101,11 @@ async fn main() {
 
     info!("");
     info!("🧙 Magicblock Validator is running!");
+    info!(
+        "🏷️ Validator version: {} (Git: {})",
+        env!("CARGO_PKG_VERSION"),
+        GIT_VERSION
+    );
     info!("-----------------------------------");
     info!("📡 RPC endpoint:       http://{}:{}", rpc_host, rpc_port);
     info!("🔌 WebSocket endpoint: ws://{}:{}", rpc_host, ws_port);