Add repo rename command

gdn-cli/src/commands/repo/rename.rs

@@ -0,0 +1,24 @@
+use clap::Parser;
+
+use crate::Environment;
+
+/// Rename an existing repository.
+#[derive(Debug, Parser)]
+pub struct Command {
+    repo: String,
+    name: String,
+}
+
+impl Command {
+    pub fn run(self, env: &Environment) -> anyhow::Result<()> {
+        let data = gdn::data::open_and_migrate(env.data_dir.clone())?;
+        let state = gdn::data::load_state(&data)?;
+        let Some(id) = state.resolve_repo_identifier(&self.repo) else {
+            println!("No repo found for identifier {}.", self.repo);
+            return Ok(());
+        };
+        gdn::data::rename_repo(&data, id, self.name.clone())?;
+        println!("Renamed repo {} ({id}) to {}.", self.repo, self.name);
+        Ok(())
+    }
+}