feat(controller): use env in clap to allow env var config

Cargo.toml

@@ -27,6 +27,7 @@ anyhow = "1.0.95"
 clap = { version = "4.5.23", features = [
   "derive",
   "deprecated",
+  "env",
   "wrap_help",
   "string",
 ] }

controller/src/bin/patagia-controller.rs

@@ -18,7 +18,7 @@ struct Cli {
     #[arg(
         long = "telemetry-otlp-endpoint",
         default_value = "http://localhost:4317",
-        value_name = "OTEL_EXPORTER_OTLP_ENDPOINT"
+        env = "OTEL_EXPORTER_OTLP_ENDPOINT",
     )]
     otlp_endpoint: Option<String>,
 
@@ -26,14 +26,14 @@ struct Cli {
         long = "log-stderr",
         short = 'v',
         default_value = "false",
-        value_name = "LOG_TO_STDERR"
+        env = "LOG_TO_STDERR"
     )]
     log_stderr: bool,
 
     #[arg(
         long = "listen-address",
         default_value = "0.0.0.0:9474",
-        value_name = "LISTEN_ADDRESS"
+        env = "LISTEN_ADDRESS"
     )]
     listen_address: String,
 }