Docker not working with latest Keycloak

[tobsec]

• Keycloak was not importing realm from json. Envvar KEYCLOAK_IMPORT is not working. See #https://github.com/keycloak/keycloak/issues/10216
• rdpgw tries to access Keycloak at http://keycloak:8080**/auth, however it is available at http://keycloak:8080/** per default. used --http-relative-path=/auth to set the path to /auth to make Keycloak available
• adduser after home path is already present will cause warning. Move up
• chown was not working in RUN. access to generated key.pem failed for rdpgw. use proposed "--chown" in COPY

[bolkedebruin]

Thanks!