Update Dockerfile

Qemu Emulation  added for Architecture support

remote-desktop/Dockerfile

@@ -1,6 +1,10 @@
-# Base Image
+# Base Image (x86_64 build only)
 FROM nishanb/ck-x-simulator-vnc-base:v3
 
+# --- Add QEMU for ARM emulation ---
+# This lets the container run on ARM hosts even if the base image is amd64
+COPY --from=multiarch/qemu-user-static:latest /usr/bin/qemu-* /usr/bin/
+
 # Switch to root user for installations
 USER 0
 
@@ -17,32 +21,31 @@ RUN apt-get update && apt-get install -y \
     telnet \
     nano \
     vim \
-    curl \
-    wget \
-    xclip
+    xclip \
+ && rm -rf /var/lib/apt/lists/*
 
-#create candidate user
+# create candidate user
 RUN useradd -m candidate
 
-#set hostname as terminal
+# set hostname as terminal
 RUN echo "export HOSTNAME=terminal" >> /headless/.bashrc
-#set terminal to bash
+# set terminal to bash
 RUN echo "export TERM=xterm" >> /headless/.bashrc
 
-#when shell open switch to candidate user
+# when shell opens, switch to candidate user
 RUN echo "cd /home/candidate && su candidate" >> /headless/.bashrc
 
-#disable asking for ssh host verification
-RUN mkdir -p /home/candidate/.ssh
-RUN touch /home/candidate/.ssh/config
-RUN echo "StrictHostKeyChecking no" >> /home/candidate/.ssh/config
-RUN echo "UserKnownHostsFile /dev/null" >> /home/candidate/.ssh/config
-
+# disable asking for ssh host verification
+RUN mkdir -p /home/candidate/.ssh && \
+    echo "StrictHostKeyChecking no" >> /home/candidate/.ssh/config && \
+    echo "UserKnownHostsFile /dev/null" >> /home/candidate/.ssh/config
 
 # Copy startup script
 COPY startup.sh /usr/local/bin/startup.sh
 RUN chmod +x /usr/local/bin/startup.sh
 
+# Copy agent
 COPY agent.py /tmp/agent.py
 
-RUN sed -i '/### every exit != 0 fails the script/a /usr/local/bin/startup.sh' /dockerstartup/vnc_startup.sh
+# Inject startup script into vnc_startup.sh
+RUN sed -i '/### every exit != 0 fails the script/a /usr/local/bin/startup.sh' /dockerstartup/vnc_startup.sh