clarifying admin requirements

Author: isshaddad

docs/guides/examples/puppeteer.mdx

@@ -153,6 +153,7 @@ In this example we use [Puppeteer](https://pptr.dev/) with a [BrowserBase](https
 <Warning>
   When web scraping, you MUST use the technique below which uses a proxy with Puppeteer. Direct
   scraping without using `browserWSEndpoint` is prohibited and will result in account suspension.
+  Screenshots are also prohibited when scraping.
 </Warning>
 
 ### Task code

docs/self-hosting/docker.mdx

@@ -184,6 +184,30 @@ docker compose down
 docker compose up -d
 ```
 
+### Creating additional worker groups
+
+To create additional worker groups beyond the bootstrap group, use the admin API endpoint. This requires admin privileges.
+
+**Making a user admin:**
+- **New users**: Set `ADMIN_EMAILS` environment variable (regex pattern) before user creation.
+- **Existing users**: Set `admin = true` in the `user` table in your database.
+
+**Creating a worker group:**
+
+```bash
+api_url=http://localhost:8030
+wg_name=my-worker
+admin_pat=tr_pat_...
+
+curl -X POST \
+  "$api_url/admin/api/v1/workers" \
+  -H "Authorization: Bearer $admin_pat" \
+  -H "Content-Type: application/json" \
+  -d "{\"name\": \"$wg_name\"}"
+```
+
+The response includes a `token` field if the worker group is newly created.
+
 ## Registry setup
 
 The registry is used to store and pull deployment images. When testing the stack locally, the defaults should work out of the box.

docs/self-hosting/env/webapp.mdx

@@ -142,5 +142,5 @@ mode: "wide"
 | `OPENAI_API_KEY`                                 | No       | —                     | OpenAI API key.                                                                                           |
 | `MACHINE_PRESETS_OVERRIDE_PATH`                  | No       | —                     | Path to machine presets override file. See [machine overrides](/self-hosting/overview#machine-overrides). |
 | `APP_ENV`                                        | No       | `NODE_ENV`            | App environment. Used for things like the title tag.                                                      |
-| `ADMIN_EMAILS`                                   | No       | —                     | Regex of user emails to automatically promote to admin.                                                   |
+| `ADMIN_EMAILS`                                   | No       | —                     | Regex of user emails to automatically promote to admin on signup. Does not apply to existing users.     |
 | `EVENT_LOOP_MONITOR_ENABLED`                     | No       | 1                     | Node.js event loop lag monitor.                                                                           |