feat: Support signing using NIP-46 bunker

Suggested-by: DanConwayDev <DanConwayDev@protonmail.com>
Signed-off-by: Awiteb <a@4rs.nl>

src/cli/commands/config/bunker.rs

@@ -0,0 +1,46 @@
+// n34 - A CLI to interact with NIP-34 and other stuff related to codes in nostr
+// Copyright (C) 2025 Awiteb <a@4rs.nl>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://gnu.org/licenses/gpl-3.0.html>.
+
+use clap::Args;
+use nostr::nips::nip46::NostrConnectURI;
+
+use crate::{
+    cli::{CliOptions, traits::CommandRunner},
+    error::{N34Error, N34Result},
+};
+
+
+#[derive(Args, Debug)]
+pub struct BunkerArgs {
+    /// Nostr Connect URL for the bunker. Omit this to remove the current bunker
+    /// URL.
+    bunker_url: Option<NostrConnectURI>,
+}
+
+
+impl CommandRunner for BunkerArgs {
+    const NEED_SIGNER: bool = false;
+
+    async fn run(self, mut options: CliOptions) -> N34Result<()> {
+        if let Some(ref bunker_url) = self.bunker_url
+            && !bunker_url.is_bunker()
+        {
+            return Err(N34Error::NotBunkerUrl);
+        }
+        options.config.bunker_url = self.bunker_url;
+        options.config.dump()
+    }
+}