Re-added charts

.docs/api/data-db.md

.docs/api/metadata-db.md

...a-service/test/src/main/java/at/tuwien/test/BaseTest.java

docker-compose.yml

helm/dbrepo/.gitignore

helm/dbrepo/Chart.lock

helm/dbrepo/Chart.yaml

helm/dbrepo/charts/grafana-10.1.1.tgz

helm/dbrepo/charts/keycloak-21.6.1.tgz

helm/dbrepo/charts/mariadb-galera-13.2.7.tgz

helm/dbrepo/charts/nginx-18.2.6.tgz

helm/dbrepo/charts/opensearch-1.4.0.tgz

helm/dbrepo/charts/prometheus-1.3.22.tgz

helm/dbrepo/charts/rabbitmq-14.0.0.tgz

helm/dbrepo/charts/seaweedfs-1.0.2.tgz

helm/dbrepo/files/01-setup-schema.sql

helm/dbrepo/templates/metadata-configmap.yaml

helm/seaweedfs/.gitignore

helm/seaweedfs/charts/common-2.28.0.tgz

helm/seaweedfs/charts/mariadb-19.1.2.tgz