Keep only the Docker client CLI

Dockerfile

@@ -20,7 +20,7 @@ RUN add-apt-repository \
 # This query the list of available docker version
 # RUN apt-get update && apt-cache madison docker-ce
 
-RUN apt-get update && apt-get install -y docker-ce=${DOCKER_VERSION} docker-ce-cli=${DOCKER_VERSION} containerd.io
+RUN apt-get update && apt-get install -y docker-ce-cli=${DOCKER_VERSION}
 
 RUN curl   -o /tmp/cern-root-ca-2.crt "https://cafiles.cern.ch/cafiles/certificates/CERN%20Root%20Certification%20Authority%202.crt" && \
       curl -o /tmp/cern-ca.crt        "https://cafiles.cern.ch/cafiles/certificates/CERN%20Certification%20Authority.crt" && \