Fix docker image inconsistency across different browsers

[Robin481]

While the upgraded Docker image that automatically includes Keycloak (https://github.com/puzzle/skills/pull/429) has solved many issues there is sadly some inconsistency across devices and browsers.

For some users it works perfectly fine, for others it only works in Firefox and then again for others in no browser at all.

Needs to be improved

Definition of Done:

• Docker image with Keycloak works consistently across devices.