chore: remove the 'tokio::main' attribute macro

Because its expansion uses expect() and we don't want that ;)
We use '?' on .build() if we can't build the tokio runtime

Author: gcavelier

src/main.rs

@@ -52,13 +52,21 @@ async fn root_handler() -> &'static str {
     "I'm Alive :D"
 }
 
+#[expect(clippy::absolute_paths, reason = "use one-time only")]
+fn main() -> Result<(), Error> {
+    tokio::runtime::Builder::new_current_thread()
+        .enable_all()
+        .build()?
+        .block_on(async { tokio_main().await })
+}
+
 #[expect(
     clippy::integer_division_remainder_used,
     reason = "Because clippy is not happy with the tokio::select macro #1"
 )]
-#[tokio::main(flavor = "current_thread")]
 #[instrument]
-async fn main() -> Result<(), Error> {
+/// Entrypoint executed by the tokio runtime
+async fn tokio_main() -> Result<(), Error> {
     // Configure tracing_subscriber with a custom formatter
     #[expect(clippy::absolute_paths, reason = "Only call to this function")]
     tracing_subscriber::fmt()