ollama: Allow specifying a bearer token

[kov]

Closes #19491

Release Notes:

• Added `token_bearer' setting for the ollama provider, to allow for authenticated API endpoints

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[notpeter]

Hi, thanks for this PR!

The bearer token shouldn't be stored in settings as it's a secret. We support reading API keys from the environment (e.g. ANTHROPIC_API_KEY, OPENAI_API_KEY) or keeping credentials in the platform specific keychain (search for cx.read_credentials and cx.write_credentials).

For example:

zed/crates/language_model/src/provider/anthropic.rs

Lines 107 to 126 in 92c29be

	fn authenticate(&self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
	if self.is_authenticated() {
	Task::ready(Ok(()))
	} else {
	let api_url = AllLanguageModelSettings::get_global(cx)
	.anthropic
	.api_url
	.clone();
	cx.spawn(|this, mut cx| async move {
	let (api_key, from_env) = if let Ok(api_key) = std::env::var(ANTHROPIC_API_KEY_VAR)
	{
	(api_key, true)
	} else {
	let (_, api_key) = cx
	.update(|cx| cx.read_credentials(&api_url))?
	.await?
	.ok_or_else(|| anyhow!("credentials not found"))?;
	(String::from_utf8(api_key)?, false)
	};

Unlike the other providers, this key would be optional (e.g. local ollama requires no auth), but we'd want to support reading OLLAMA_API_KEY from the environment or providing a key on the Assistant configuration page like we do for OpenAI/Anthropic/Gemini.

[kov]

That makes sense, thank you for the quick feedback! I have started on that path. It is quite a bit more code. I got the UI to render, most of the code structure is in place, I believe, but it is still not working and the UI could use a little bit more love. I will try to get it finished during the week, may need to wait for the weekend, though.