acp: Handle Gemini Auth Better (#36631)

Release Notes:

- N/A

---------

Co-authored-by: Danilo Leal <daniloleal09@gmail.com>

crates/agent_servers/src/gemini.rs

@@ -5,6 +5,7 @@ use crate::{AgentServer, AgentServerCommand};
 use acp_thread::{AgentConnection, LoadError};
 use anyhow::Result;
 use gpui::{Entity, Task};
+use language_models::provider::google::GoogleLanguageModelProvider;
 use project::Project;
 use settings::SettingsStore;
 use ui::App;
@@ -47,7 +48,7 @@ impl AgentServer for Gemini {
                 settings.get::<AllAgentServersSettings>(None).gemini.clone()
             })?;
 
-            let Some(command) =
+            let Some(mut command) =
                 AgentServerCommand::resolve("gemini", &[ACP_ARG], None, settings, &project, cx).await
             else {
                 return Err(LoadError::NotInstalled {
@@ -57,6 +58,10 @@ impl AgentServer for Gemini {
                 }.into());
             };
 
+            if let Some(api_key)= cx.update(GoogleLanguageModelProvider::api_key)?.await.ok() {
+                command.env.get_or_insert_default().insert("GEMINI_API_KEY".to_owned(), api_key.key);
+            }
+
             let result = crate::acp::connect(server_name, command.clone(), &root_dir, cx).await;
             if result.is_err() {
                 let version_fut = util::command::new_smol_command(&command.path)