feat: add Ollama authentication secret and reference to agent gateway backend configuration

04-agentgateway-proxy/templates/agentgateway-backend-ollama.yaml

@@ -16,4 +16,7 @@ spec:
         '*': Passthrough
         /v1/chat/completions: Completions
         /v1/embeddings: Passthrough
-        /v1/models: Passthrough
+        /v1/models: Passthrough
+  auth:
+    secretRef:
+      name: ollama-secret

04-agentgateway-proxy/templates/ollama-secret.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+data:
+  Authorization: b2xsYW1h
+kind: Secret
+metadata:
+  name: ollama-secret
+  namespace: agentgateway-system
+type: Opaque