title: Can't start docker container with Keycloak 16, exited with code 1
body: <p>I'm a newbie with docker, today I'm trying to start my docker container with keycloak without success, I haven't made any change to the container and it just doesn't want to start up.
  Here is the docker log error:</p>
  <pre><code>*** JBossAS process (188) received TERM signal ***
  User with username 'admin' already added to '/opt/jboss/keycloak/standalone/configuration/keycloak-add-user.json'
  </code></pre>
  <p>The container is not inside any volume, and it was created using the command</p>
  <pre><code>docker run -p 8080:8080 -e KEYCLOAK_ADMIN=admin -e KEYCLOAK_ADMIN_PASSWORD=admin quay.io/keycloak/keycloak:16.1.0
  </code></pre>