chore(cursor): update mcp example to use GitHub (#330)

Author: matifali

registry/coder/modules/cursor/README.md

@@ -16,7 +16,7 @@ Uses the [Coder Remote VS Code Extension](https://github.com/coder/vscode-coder)
 module "cursor" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/cursor/coder"
-  version  = "1.3.0"
+  version  = "1.3.1"
   agent_id = coder_agent.example.id
 }
 ```
@@ -29,7 +29,7 @@ module "cursor" {
 module "cursor" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/cursor/coder"
-  version  = "1.3.0"
+  version  = "1.3.1"
   agent_id = coder_agent.example.id
   folder   = "/home/coder/project"
 }
@@ -39,23 +39,29 @@ module "cursor" {
 
 Provide a JSON-encoded string via the `mcp` input. When set, the module writes the value to `~/.cursor/mcp.json` using a `coder_script` on workspace start.
 
+The following example configures Cursor to use the GitHub MCP server with authentication facilitated by the [`coder_external_auth`](https://coder.com/docs/admin/external-auth#configure-a-github-oauth-app) resource.
+
 ```tf
 module "cursor" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/cursor/coder"
-  version  = "1.3.0"
+  version  = "1.3.1"
   agent_id = coder_agent.example.id
+  folder   = "/home/coder/project"
   mcp = jsonencode({
     mcpServers = {
-      coder = {
-        command = "coder"
-        args    = ["exp", "mcp", "server"]
-        env = {
-          CODER_MCP_APP_STATUS_SLUG = "cursor"
-          CODER_MCP_AI_AGENTAPI_URL = "http://localhost:3284"
-        }
+      "github" : {
+        "url" : "https://api.githubcopilot.com/mcp/",
+        "headers" : {
+          "Authorization" : "Bearer ${data.coder_external_auth.github.access_token}",
+        },
+        "type" : "http"
       }
     }
   })
 }
+
+data "coder_external_auth" "github" {
+  id = "github"
+}
 ```