mod: refactor commands to global commands, restrict from direct messages

nix build works too

src/main.rs

@@ -11,9 +11,8 @@ use serenity::async_trait;
 use serenity::builder::{
     CreateInteractionResponse, CreateInteractionResponseMessage, EditInteractionResponse,
 };
-use serenity::model::application::Interaction;
+use serenity::model::application::{Command, Interaction, InteractionContext};
 use serenity::model::gateway::Ready;
-use serenity::model::id::GuildId;
 use serenity::prelude::*;
 use songbird::SerenityInit;
 use tokio::sync::Mutex;
@@ -84,22 +83,18 @@ impl EventHandler for Handler {
     async fn ready(&self, ctx: Context, ready: Ready) {
         println!("{} is connected!", ready.user.name);
 
-        let guild_id = GuildId::new(
-            env::var("GUILD_ID")
-                .expect("Expected GUILD_ID in environment")
-                .parse()
-                .expect("GUILD_ID must be an integer"),
-        );
-
         let commands = vec![
             commands::start::register(),
             commands::reset::register(),
             commands::lock::register(),
             commands::unlock::register(),
             commands::stop::register(),
-        ];
+        ]
+        .into_iter()
+        .map(|command| command.add_context(InteractionContext::Guild))
+        .collect();
 
-        if let Err(why) = guild_id.set_commands(&ctx.http, commands).await {
+        if let Err(why) = Command::set_global_commands(&ctx.http, commands).await {
             println!("Cannot register slash commands: {why}");
         }