This pull request adds a list implementation that can be used
in a generic way and adds everything that might be needed in
later implementation of other data structurs.
Reviewed-on: #1
PR #1
An external repository is holding now the src and
Dockerfile for conventi so this is no longer needed.
In the same step we now use the tag from the external
image to run our pipeline.
Reviewed-on: #11
PR #11
