Add 'run' subcommand

For future extensibility

README.md

@@ -85,4 +85,4 @@ updater-server=http://invalid.example
 ### Running factoriauth
 
 Either use `cargo install --path .` and follow its instructions for how to update `$PATH`, then run
-`factoriauth`, or run the program straight from the repository: `cargo run`.
+`factoriauth run`, or run the program straight from the repository: `cargo run -- run`.

src/main.rs

@@ -35,7 +35,7 @@ use std::{env, path::PathBuf, sync::Arc};
 use auth::{
     AuthenticationBackend, ServerPadlockGenerator, UserAuthenticator, UserServerKeyGenerator,
 };
-use clap::Parser;
+use clap::{Parser, Subcommand};
 use color_eyre::{eyre::Context, Result};
 use config::Config;
 use db::{Database, SqliteDatabase};
@@ -92,11 +92,20 @@ async fn load_config(path: &str) -> Result<Config> {
     Ok(toml::from_str(&content)?)
 }
 
+#[derive(Debug, Clone, Subcommand)]
+enum Command {
+    /// Run factoriauth
+    Run,
+}
+
 #[derive(Debug, Clone, Parser)]
 struct Args {
     /// Path to the configuration file.
     #[arg(short, long, default_value = "config.toml")]
     config: String,
+
+    #[command(subcommand)]
+    command: Command,
 }
 
 #[tokio::main]
@@ -104,6 +113,10 @@ struct Args {
 async fn main() -> Result<()> {
     let args = Args::parse();
 
+    match args.command {
+        Command::Run => {}
+    }
+
     init().context("Failed to initialize tracing")?;
 
     let config = load_config(&args.config).await.with_context(|| {