Update Dockerfile to install screen package

Signed-off-by: Mario Vejlupek <mario@vejlupek.cz>

Author: devopsmariocom

Dockerfile

@@ -9,4 +9,4 @@ CMD ["-c", "while true; do echo sleep 3;sleep 3; done"]
 
 RUN export DEBIAN_FRONTEND=noninteractive && \
     export DEBCONF_NONINTERACTIVE_SEEN=true && \
-    apt-get update && apt-get install -y curl telnet ssh rsync && rm -rf /var/lib/apt/lists/*
+    apt-get update && apt-get install -y curl telnet ssh rsync screen && rm -rf /var/lib/apt/lists/*