added nano to ssh server

docker/ssh-server/Dockerfile

@@ -13,13 +13,16 @@ ENV DEBIAN_FRONTEND=noninteractive
 # Install core dependencies:
 # - Python 3 and pip
 # - OpenSSH server for remote access
-# - sudo for privilege escalation
+# - curl
+# - nano
+
 RUN apt-get update && \
     apt-get install -y \
     python3 \
     python3-pip \
     openssh-server \
-    curl && \
+    curl \
+    nano && \
     mkdir /var/run/sshd && \
     apt-get clean