Updated Keycloak in the K8S environment to use HTTPS

dbrepo-gateway-service/dbrepo.conf

helm/dbrepo/README.md

helm/dbrepo/charts/seaweedfs-4.2.1.tgz

helm/dbrepo/templates/auth-configmap.yaml

helm/dbrepo/templates/gateway-configmap.yaml

helm/dbrepo/templates/ui-secret.yaml

helm/dbrepo/values.schema.json

helm/dbrepo/values.yaml

...src/main/java/at/ac/tuwien/ifs/dbrepo/core/Serialize.java

...main/java/at/ac/tuwien/ifs/dbrepo/core/test/BaseTest.java

...e/src/main/java/at/ac/tuwien/ifs/dbrepo/core/test/pom.xml