Keycloak redirect works on logout page but not on login page

Steps to recreate

1. Set up docker dev environment with `COMPOSE_PROFILE=standalone-keycloak`
2. Navigate to http://localhost:8002
3. Expect browser to redirect to http://0.0.0.0:8080/auth/realms/… but it does not
4. Log in as a non-SSO user via Galaxy login page at http://localhost:8002
5. Click user name and `Logout`
6. See that browser takes you to SSO login page at http://0.0.0.0:8080/auth/realms/… and you can log in with an SSO user (this confirms that keycloak+ldap is working)