[feat](trx-rs): show server/client build info in HTTP footer

Add compile-time build dates for trx-server and trx-frontend-http, propagate server build metadata through rig state/snapshot, and render both versions + build dates in the HTTP footer.

Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>

src/trx-server/Cargo.toml

@@ -6,6 +6,7 @@
 name = "trx-server"
 version = "0.1.0"
 edition = "2021"
+build = "build.rs"
 
 [dependencies]
 tokio = { workspace = true, features = ["full"] }

src/trx-server/build.rs

@@ -0,0 +1,25 @@
+use std::time::{SystemTime, UNIX_EPOCH};
+
+fn utc_ymd_from_unix_secs(secs: i64) -> (i32, u32, u32) {
+    let days = secs.div_euclid(86_400);
+    let z = days + 719_468;
+    let era = if z >= 0 { z } else { z - 146_096 } / 146_097;
+    let doe = z - era * 146_097;
+    let yoe = (doe - doe / 1_460 + doe / 36_524 - doe / 146_096) / 365;
+    let mut y = yoe + era * 400;
+    let doy = doe - (365 * yoe + yoe / 4 - yoe / 100);
+    let mp = (5 * doy + 2) / 153;
+    let d = doy - (153 * mp + 2) / 5 + 1;
+    let m = mp + if mp < 10 { 3 } else { -9 };
+    y += if m <= 2 { 1 } else { 0 };
+    (y as i32, m as u32, d as u32)
+}
+
+fn main() {
+    let secs = match SystemTime::now().duration_since(UNIX_EPOCH) {
+        Ok(d) => d.as_secs() as i64,
+        Err(_) => 0,
+    };
+    let (y, m, d) = utc_ymd_from_unix_secs(secs);
+    println!("cargo:rustc-env=TRX_SERVER_BUILD_DATE={y:04}-{m:02}-{d:02}");
+}

src/trx-server/src/main.rs

@@ -224,6 +224,7 @@ fn build_rig_task_config(
         initial_mode: cfg.rig.initial_mode.clone(),
         server_callsign: resolved.callsign.clone(),
         server_version: Some(env!("CARGO_PKG_VERSION").to_string()),
+        server_build_date: Some(env!("TRX_SERVER_BUILD_DATE").to_string()),
         server_latitude: resolved.latitude,
         server_longitude: resolved.longitude,
         pskreporter_status,
@@ -302,6 +303,7 @@ async fn main() -> DynResult<()> {
     let initial_state = RigState::new_with_metadata(
         resolved.callsign.clone(),
         Some(env!("CARGO_PKG_VERSION").to_string()),
+        Some(env!("TRX_SERVER_BUILD_DATE").to_string()),
         resolved.latitude,
         resolved.longitude,
         cfg.rig.initial_freq_hz,

src/trx-server/src/rig_task.rs

@@ -38,6 +38,7 @@ pub struct RigTaskConfig {
     pub initial_mode: RigMode,
     pub server_callsign: Option<String>,
     pub server_version: Option<String>,
+    pub server_build_date: Option<String>,
     pub server_latitude: Option<f64>,
     pub server_longitude: Option<f64>,
     pub pskreporter_status: Option<String>,
@@ -60,6 +61,7 @@ impl Default for RigTaskConfig {
             initial_mode: RigMode::USB,
             server_callsign: None,
             server_version: None,
+            server_build_date: None,
             server_latitude: None,
             server_longitude: None,
             pskreporter_status: None,
@@ -102,6 +104,7 @@ pub async fn run_rig_task(
     let mut state = RigState::new_with_metadata(
         config.server_callsign.clone(),
         config.server_version.clone(),
+        config.server_build_date.clone(),
         config.server_latitude,
         config.server_longitude,
         config.initial_freq_hz,