feat: update with ssh agent support

Signed-off-by: kjuulh <contact@kjuulh.io>

cuddle_cli/src/context.rs

@@ -121,12 +121,16 @@ fn pull_parent_cuddle_into_local(
 ) -> anyhow::Result<()> {
     let mut rc = RemoteCallbacks::new();
     rc.credentials(|_url, username_from_url, _allowed_types| {
-        git2::Cred::ssh_key(
-            username_from_url.unwrap(),
-            None,
-            Path::new(&format!("{}/.ssh/id_ed25519", env::var("HOME").unwrap())),
-            None,
-        )
+        if "true".to_string() == std::env::var("CUDDLE_SSH_AGENT").ok().unwrap_or("".into()) {
+            git2::Cred::ssh_key_from_agent(username_from_url.unwrap())
+        } else {
+            git2::Cred::ssh_key(
+                username_from_url.unwrap(),
+                None,
+                Path::new(&format!("{}/.ssh/id_ed25519", env::var("HOME").unwrap())),
+                None,
+            )
+        }
     });
 
     let mut fo = FetchOptions::new();