Enable pinning of content repository version in Dockerfile #56
Description
Is your feature request related to a problem? Please describe.
Currently it is only possible to set the branch of the automatically imported pattern-atlas content. It is not possible to specify a specific tag or release for this branch.
Describe the solution you'd like
Extend copy_initial_data.sh s.t. it pulls a specifically tagged version of the content repository.
This includes creating a new parameter for the Dockerfile PATTERN_ATLAS_CONTENT_REPOSITORY_TAG or similar that allows setting this tag. If it is not given it should pull the latest commit of this branch as it is implemented currently.
Additional context
Currently deployed versions of this docker container will always pull the latest content changes even if they might not be supported by the running pattern-atlas-api.