launch: replace deprecated OPENAI_BASE_URL with config.toml profile for codex (#15041)

docs/integrations/codex.mdx

@@ -35,36 +35,39 @@ To use `codex` with Ollama, use the `--oss` flag:
 codex --oss
 ```
 
-### Changing Models
-
-By default, codex will use the local `gpt-oss:20b` model. However, you can specify a different model with the `-m` flag:
+To use a specific model, pass the `-m` flag:
 
 ```
 codex --oss -m gpt-oss:120b
 ```
 
-### Cloud Models
+To use a cloud model:
 
 ```
 codex --oss -m gpt-oss:120b-cloud
 ```
 
+### Profile-based setup
 
-## Connecting to ollama.com
-
-
-Create an [API key](https://ollama.com/settings/keys) from ollama.com and export it as `OLLAMA_API_KEY`.
-
-To use ollama.com directly, edit your `~/.codex/config.toml` file to point to ollama.com.
+For a persistent configuration, add an Ollama provider and profiles to `~/.codex/config.toml`:
 
 ```toml
-model = "gpt-oss:120b"
-model_provider = "ollama"
-
-[model_providers.ollama]
+[model_providers.ollama-launch]
 name = "Ollama"
-base_url = "https://ollama.com/v1"
-env_key = "OLLAMA_API_KEY"
+base_url = "http://localhost:11434/v1"
+
+[profiles.ollama-launch]
+model = "gpt-oss:120b"
+model_provider = "ollama-launch"
+
+[profiles.ollama-cloud]
+model = "gpt-oss:120b-cloud"
+model_provider = "ollama-launch"
 ```
 
-Run `codex` in a new terminal to load the new settings.
+Then run:
+
+```
+codex --profile ollama-launch
+codex --profile ollama-cloud
+```