docs: add IS_MULTIWORKSPACE_ENABLED documentation (#16758)

## Summary

Adds comprehensive documentation for the `IS_MULTIWORKSPACE_ENABLED`
configuration variable, which was previously undocumented despite being
a fundamental configuration option that significantly changes how Twenty
behaves.

## Changes

### Self-Host Setup Guide (`setup.mdx`)

Added a new **Multi-Workspace Mode** section that explains:

- **Single-workspace mode (default)**: Only one workspace allowed, first
user gets admin privileges, signups disabled after first workspace
- **Multi-workspace mode**: Multiple workspaces with subdomain-based
URLs (e.g., `sales.your-domain.com`)
- **Related config variables**: `DEFAULT_SUBDOMAIN` and
`IS_WORKSPACE_CREATION_LIMITED_TO_SERVER_ADMINS`
- **DNS configuration**: Wildcard DNS setup for dynamic subdomains
- **Workspace creation restrictions**: How to limit workspace creation
to server admins

### Local Setup Guide (`local-setup.mdx`)

Added an info callout in the environment variables section to make
contributors aware of multi-workspace mode, useful when testing
subdomain-based features.

## Why This Matters

The `IS_MULTIWORKSPACE_ENABLED` variable controls:
- Whether multiple workspaces can exist on a single instance
- URL structure (plain domain vs subdomains)
- First user privileges
- Sign-up behavior after initial setup
- SSO workspace resolution logic

This is critical knowledge for self-hosters who want to run Twenty as a
multi-tenant SaaS.
This commit is contained in:
Félix Malfait
2025-12-22 18:10:41 +01:00
committed by GitHub
parent 6a31f0667e
commit 0dec4b9b67
2 changed files with 59 additions and 0 deletions
@@ -235,6 +235,10 @@ cp ./packages/twenty-front/.env.example ./packages/twenty-front/.env
cp ./packages/twenty-server/.env.example ./packages/twenty-server/.env
```
<Info>
**Multi-Workspace Mode:** By default, Twenty runs in single-workspace mode where only one workspace can be created. To enable multi-workspace support (useful for testing subdomain-based features), set `IS_MULTIWORKSPACE_ENABLED=true` in your server `.env` file. See [Multi-Workspace Mode](/developers/self-host/capabilities/setup#multi-workspace-mode) for details.
</Info>
## Step 6: Installing dependencies
To build Twenty server and seed some data into your database, run the following command:
```bash