add rsync to docker image for alpine-ssh

docker/alpine-ssh.Dockerfile

@@ -5,12 +5,14 @@ FROM alpine:latest
 LABEL maintainer="fabian.gabel@tuhh.de"
 LABEL version="0.1"
 LABEL description="This is custom Docker Image for \
-alpine with further tools in order to use openssh."
+alpine with further tools in order to use openssh/rsync and bash."
 
 # Disable Prompt During Packages Installation
 
 # Update Ubuntu Software repository
 RUN apk update 
-RUN apk add openssh-client bash
+RUN apk add openssh-client 
+RUN apk add bash
+RUN apk add rsync
 
 CMD /bin/bash
\ No newline at end of file