changed ssh client ubuntu to alpine

docker/ssh-client/Dockerfile

@@ -1,4 +1,7 @@
-FROM ubuntu:latest  
+FROM alpine:latest
 
-RUN apt-get update && apt-get upgrade -y 
-RUN apt-get install -y openssh-client --fix-missing
+# Install SSH client and bash
+RUN apk add --no-cache openssh-client bash
+
+# Default command
+CMD ["/bin/bash"]