Add tokio_unstable config, defaults for values

.cargo/config

@@ -0,0 +1,2 @@
+[build]
+rustflags = ["--cfg", "tokio_unstable"]

README.md

@@ -5,7 +5,22 @@ Note: pict-rs-admin is not intended to be exposed to the internet.
 
 ## Running
 ```bash
-$ pict-rs-admin -h
+$ ./pict-rs-admin -h
+Usage: pict-rs-admin [OPTIONS] --pict-rs-api-key <PICT_RS_API_KEY>
+
+Options:
+  -b, --bind-address <BIND_ADDRESS>
+          [env: PICTRS_ADMIN__BIND_ADDRESS=] [default: 127.0.0.0:8084]
+      --pict-rs-endpoint <PICT_RS_ENDPOINT>
+          [env: PICTRS_ADMIN__PICTRS_ENDPOINT=] [default: http://localhost:8080]
+      --pict-rs-api-key <PICT_RS_API_KEY>
+          [env: PICTRS_ADMIN__PICTRS_API_KEY=]
+      --opentelemetry-url <OPENTELEMETRY_URL>
+          [env: PICTRS_ADMIN__OPENTELEMETRY_URL=]
+      --opentelemetry-event-buffer-size <OPENTELEMETRY_EVENT_BUFFER_SIZE>
+          [env: PICTRS_ADMIN__OPENTELEMETRY_EVENT_BUFFER_SIZE=]
+  -h, --help
+          Print help
 ```
 
 ## Contributing

pict-rs-admin.nix

@@ -13,6 +13,8 @@ rustPlatform.buildRustPackage {
   PROTOC = "${protobuf}/bin/protoc";
   PROTOC_INCLUDE = "${protobuf}/include";
 
+  RUSTFLAGS = "--cfg tokio_unstable";
+
   nativeBuildInputs = [ ];
 
   passthru.tests = { inherit (nixosTests) pict-rs-admin; };

src/main.rs

@@ -22,9 +22,18 @@ use url::Url;
 
 #[derive(Debug, Parser)]
 struct Args {
-    #[clap(short, long, env = "PICTRS_ADMIN__BIND_ADDRESS")]
+    #[clap(
+        short,
+        long,
+        env = "PICTRS_ADMIN__BIND_ADDRESS",
+        default_value = "127.0.0.0:8084"
+    )]
     bind_address: SocketAddr,
-    #[clap(long, env = "PICTRS_ADMIN__PICTRS_ENDPOINT")]
+    #[clap(
+        long,
+        env = "PICTRS_ADMIN__PICTRS_ENDPOINT",
+        default_value = "http://localhost:8080"
+    )]
     pict_rs_endpoint: Url,
     #[clap(long, env = "PICTRS_ADMIN__PICTRS_API_KEY")]
     pict_rs_api_key: String,