Update novnc/Dockerfile

novnc/Dockerfile

@@ -2,6 +2,9 @@
 FROM alpine/base
 USER root
 
+# Build ARG for additional packages to install (eg, openssh)
+ARG addpkg
+
 # Install ssh client
 RUN apk add --no-cache \
     openssh-client \
@@ -31,5 +34,5 @@ fi
 ssh ${MYVNC_VNCSSH_HOST} -L ${MYVNC_VNCLISTEN_HOST:-5900}:localhost:${MYVNC_VNCSSH_PORT} &
 01-init
 
-# Reset user home directory
-USER user
+# Default environment
+USER ${debug:-user}