swarmctl: forge make-admin

Calls POST /api/forge/users/{name}/admin and prints what it found. It
fails with the controller's message when the user has not logged in via
SSO yet, and when the name is an agent's.

Refs #3782

swarmctl/src/agent.rs

@@ -107,7 +107,7 @@ pub(crate) fn create(socket: &Path, name: &str, hive: &str) -> Result<()> {
 /// Parse a CLI-supplied name into a validated identifier, naming which
 /// argument was wrong — `invalid hive` and `invalid agent name` send the
 /// operator to different flags.
-fn parse_ident(value: &str, what: &str) -> Result<String> {
+pub(crate) fn parse_ident(value: &str, what: &str) -> Result<String> {
     hive_types::Ident::parse(value)
         .map(hive_types::Ident::into_string)
         .map_err(|reason| anyhow::anyhow!("invalid {what} {value:?}: {reason}"))
@@ -186,7 +186,7 @@ async fn post_create(socket: &Path, name: &str, hive: &str) -> Result<CreateAgen
 /// `what` names the request in error messages — the operator needs to know
 /// which call failed, and every other part of this function is identical
 /// between the two verbs.
-async fn post<Req: Serialize, Resp: serde::de::DeserializeOwned>(
+pub(crate) async fn post<Req: Serialize, Resp: serde::de::DeserializeOwned>(
     socket: &Path,
     uri: &str,
     request: &Req,