add docker client to install list

Dockerfile

@@ -10,11 +10,11 @@ ENV STRPC_BASE /var/lib/strpc
 
 ADD ./sources.list /etc/apt/sources.list
 
-RUN apt update && apt install -y python3-pip
+RUN apt update && apt install -y python3-pip docker.io
 
 RUN pip3 install pipenv
 
-RUN mkdir -p /var/lib/strpc 
+RUN mkdir -p /var/lib/strpc
 
 ADD . /var/app