PostUser requires organization

[Emyrk]

coder/coderd/users.go

Lines 352 to 370 in 993c1a6

	} else {
	// If no organization is provided, add the user to the first
	// organization.
	organizations, err := api.Database.GetOrganizations(ctx)
	if err != nil {
	httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
	Message: "Internal error fetching orgs.",
	Detail: err.Error(),
	})
	return
	}
	if len(organizations) > 0 {
	// Add the user to the first organization. Once multi-organization
	// support is added, we should enable a configuration map of user
	// email to organization.
	req.OrganizationID = organizations[0].ID
	}
	}

Currently the org component of the request is not required.

Blocked by #11961

[ammario]

What do you think about all users are automatically added to the default org to create continuity for current customers, and when deployments grow to a point where the "default" org is a security risk, they can remove all templates / provisioners from that org and move all functionality into the extra orgs.