Publish: Warn when keyring has no password (#8827)

When trying to upload without a password but with the keyring, check
that the keyring has a password for the upload URL and username and warn
if it doesn't.

Fixes #8781

crates/uv-auth/src/credentials.rs

@@ -76,7 +76,7 @@ impl Credentials {
         }
     }
 
-    pub(crate) fn username(&self) -> Option<&str> {
+    pub fn username(&self) -> Option<&str> {
         self.username.as_deref()
     }
 
@@ -84,7 +84,7 @@ impl Credentials {
         self.username.clone()
     }
 
-    pub(crate) fn password(&self) -> Option<&str> {
+    pub fn password(&self) -> Option<&str> {
         self.password.as_deref()
     }
 

crates/uv-auth/src/keyring.rs

@@ -35,7 +35,7 @@ impl KeyringProvider {
     /// Returns [`None`] if no password was found for the username or if any errors
     /// are encountered in the keyring backend.
     #[instrument(skip_all, fields(url = % url.to_string(), username))]
-    pub(crate) async fn fetch(&self, url: &Url, username: &str) -> Option<Credentials> {
+    pub async fn fetch(&self, url: &Url, username: &str) -> Option<Credentials> {
         // Validate the request
         debug_assert!(
             url.host_str().is_some(),