Remove useless gitlab tokens & use git clone

Dockerfile

@@ -7,26 +7,17 @@ RUN cd build && python3 setup.py sdist
 FROM registry.gitlab.teklia.com/arkindex/tasks/base:libmagic
 
 ARG CLIENT_BRANCH=master
-ARG CLIENT_ID=7122981
 ARG TRANSKRIBUS_BRANCH=master
-ARG TRANSKRIBUS_ID=11180199
-ARG GITLAB_TOKEN="M98p3wihATgCx4Z5ChvK"
 
 # Install api-client via the repo - allows testing using other branches
-RUN \
-  mkdir /tmp/client && \
-  wget --header "PRIVATE-TOKEN: $GITLAB_TOKEN" https://gitlab.com/api/v4/projects/$CLIENT_ID/repository/archive.tar.gz?sha=$CLIENT_BRANCH -O /tmp/client/archive.tar.gz && \
-  tar --strip-components=1 -xvf /tmp/client/archive.tar.gz -C /tmp/client && \
+RUN git clone --branch=$CLIENT_BRANCH https://gitlab.teklia.com/arkindex/api-client.git /tmp/client && \
   cd /tmp/client && \
   pip install git+https://gitlab.teklia.com/arkindex/apistar.git && \
   python setup.py install && \
   rm -rf /tmp/client
 
 # Install Transkribus client from the repo
-RUN \
-  mkdir /tmp/transkribus && \
-  wget --header "PRIVATE-TOKEN: $GITLAB_TOKEN" https://gitlab.com/api/v4/projects/$TRANSKRIBUS_ID/repository/archive.tar.gz?sha=$TRANSKRIBUS_BRANCH -O /tmp/transkribus/archive.tar.gz && \
-  tar --strip-components=1 -xvf /tmp/transkribus/archive.tar.gz -C /tmp/transkribus && \
+RUN git clone --branch=$TRANSKRIBUS_BRANCH https://gitlab.teklia.com/arkindex/transkribus /tmp/transkribus && \
   cd /tmp/transkribus && python setup.py install && \
   rm -rf /tmp/transkribus