Adds Slack OAuth authentication to your user resource

Example

mix ash_authentication.add_strategy.slack

Options

• --user, -u - The user resource. Defaults to YourApp.Accounts.User
• --accounts, -a - The accounts domain. Defaults to YourApp.Accounts
• --identity-field, -i - The field used to identify the user. Defaults to email
• --team-id - Optional Slack team ID to restrict sign-in to a specific workspace