Create a Vault UI user using the vault CLI

I would like to create a hashicorp vault UI login user before ever having to login to the GUI with the root token.

Initially I have the root token and CLI access to the vault.

How can I create a GUI login username+password and grant complete read rights via the CLI exclusively?

The vault is newly installed, essentially unconfigured with any policies.

This is intended to be part of a BASH script.

• Authenticate with the root token.

vault login <root token>

• Enable the userpass authentication method.

vault auth enable userpass

• Create a Vault policy for global read permissions.

# read-only.hcl
path "*" {
  capabilities = ["read", "list"]
}

vault policy write read-only read-only.hcl

• Create an user with the read permissions policy attached.

vault write auth/userpass/users/<username> password=<password> policies=read-only

• Login to the GUI with the userpass method with the created user.