editoast: change from 'env_logger' to 'tracing-subscriber'

With the objective to instrument `editoast` with OpenTelemetry,
let's use `tracing-subscriber` which will allow to configure a
stdout logger with an Opentelemetry emitter.

editoast/Cargo.toml

@@ -45,7 +45,7 @@ actix-files = "0.6.5"
 actix-web = "4.4.1"
 actix-http = "3.5.1"
 actix-cors = "0.7.0"
-env_logger = "0.10.1"
+tracing-subscriber = { version = "0.3.18", features = [ "env-filter" ] }
 log = "0.4.20"
 redis = { version = "0.24.0", features = [
     "tokio-comp",

editoast/src/main.rs

@@ -70,10 +70,20 @@ use views::search::{SearchConfig, SearchConfigFinder, SearchConfigStore};
 
 type DbPool = Pool<PgConnection>;
 
+fn init_tracing() {
+    tracing_subscriber::registry()
+        .with(
+            tracing_subscriber::EnvFilter::builder()
+                // Set the default log level to 'info'
+                .with_default_directive(tracing_subscriber::filter::LevelFilter::INFO.into())
+                .from_env_lossy(),
+        )
+        .with(tracing_subscriber::fmt::layer().pretty())
+}
+
 #[actix_web::main]
 async fn main() {
-    // Set the default log level to 'info'
-    env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
+    init_tracing();
 
     match run().await {
         Ok(_) => (),