Adds information about using openai component to work with Ollama local models (#4756)

* add ollama openai compatibility component layer information

Signed-off-by: Filinto Duran <[email protected]>

* Update daprdocs/content/en/reference/components-reference/supported-conversation/ollama.md

Co-authored-by: Mark Fussell <[email protected]>
Signed-off-by: Filinto Duran <[email protected]>

* Update daprdocs/content/en/reference/components-reference/supported-conversation/ollama.md

Co-authored-by: Mark Fussell <[email protected]>
Signed-off-by: Filinto Duran <[email protected]>

---------

Signed-off-by: Filinto Duran <[email protected]>
Co-authored-by: Mark Fussell <[email protected]>
Co-authored-by: Marc Duiker <[email protected]>

Author: 3 people

daprdocs/content/en/reference/components-reference/supported-conversation/ollama.md

@@ -34,6 +34,26 @@ The above example uses secrets as plain strings. It is recommended to use a secr
 | `model` | N | The Ollama LLM to use. Defaults to `llama3.2:latest`.  | `phi4:latest` |
 | `cacheTTL` | N | A time-to-live value for a prompt cache to expire. Uses Golang duration format.  | `10m` |
 
+### OpenAI Compatibility
+
+Ollama is compatible with [OpenAI's API](https://ollama.com/blog/openai-compatibility). You can use the OpenAI component with Ollama models with the following changes:
+
+```yaml
+apiVersion: dapr.io/v1alpha1
+kind: Component
+metadata:
+  name: ollama-openai
+spec:
+  type: conversation.openai # use the openai component type
+  metadata:
+  - name: key
+    value: 'ollama' # just any non-empty string
+  - name: model
+    value: gpt-oss:20b  # an ollama model (https://ollama.com/search) in this case openai open source model. See https://ollama.com/library/gpt-oss
+  - name: endpoint
+    value: 'http://localhost:11434/v1' # ollama endpoint
+```
+
 ## Related links
 
 - [Conversation API overview]({{< ref conversation-overview.md >}})