GitLab

Replace k8s manifest with helm chart

See merge request !1

restrictions of sets and metadataPrefixes

preparations to include flexible configuations for these parameters
based on configMaps
some thoughts how to use these additional resorictions on query
component (for us by now ES)

.gitla-ci.yml ...

files to provide people coming from outside an easier understanding for
the implementation

error handling
a little bit code refactoring

foundation for the next step where requests throwing a failure situation are handled by dedicated error response handler
(a lot of files weren't included in the former commit)

are handled by dedicated error response handler

metadata record section of an OAI result needs a namespace - otherwise standard OAI clients are not able to fetch the result