test: fix recipe and audio tests to avoid side effects (#6231)

Signed-off-by: Adrian Cole <adrian@tetrate.io>

crates/goose-server/Cargo.toml

@@ -62,3 +62,4 @@ path = "src/bin/generate_schema.rs"
 tower = "0.5"
 async-trait = "0.1.89"
 tempfile = "3.15.0"
+env-lock = "1.0.1"

crates/goose-server/src/routes/audio.rs

@@ -395,6 +395,8 @@ mod tests {
 
     #[tokio::test(flavor = "multi_thread")]
     async fn test_transcribe_endpoint_requires_auth() {
+        let _guard = env_lock::lock_env([("OPENAI_API_KEY", Some("fake-openai-no-keyring"))]);
+
         let state = AppState::new().await.unwrap();
         let app = routes(state);
         // Test without auth header