Update Dockerfile

Dockerfile

@@ -1,27 +1,9 @@
 FROM ubuntu:latest
 ENV DEBIAN_FRONTEND=noninteractive
-RUN apt-get update && apt-get install -y \
-    lxde \
-    aqemu \
-    sudo \
-    curl \
-    wget \
-    aria2 \
-    qemu-system-x86 \
-    htop \
-    firefox \
-    tigervnc-standalone-server \
-    python3-pip \
-    python3-websockify \
-    python3 \
-    git
-
+ENV PACKAGES="lxde aqemu sudo curl wget aria2 qemu-system-x86 htop firefox tigervnc-standalone-server python3-pip python3-websockify python3 git"
+RUN apt-get update && apt-get install -y $PACKAGES
 RUN git clone https://github.com/novnc/noVNC.git /home/user/noVNC
-RUN useradd -m -u 1000 user && \
-    usermod -aG sudo user && \
-    echo "%sudo        ALL=(ALL:ALL) NOPASSWD:ALL" > /etc/sudoers.d/user && \
-    chmod 0440 /etc/sudoers.d/user
+RUN useradd -m -u 1000 user && usermod -aG sudo user && echo "%sudo ALL=(ALL:ALL) NOPASSWD:ALL" > /etc/sudoers.d/user && chmod 0440 /etc/sudoers.d/user
 RUN sudo chown -R user /home/user
-ENV HOME=/home/user \
-    PATH=/home/user/.local/bin:$PATH
+ENV HOME=/home/user PATH=/home/user/.local/bin:$PATH
 CMD vncserver -SecurityTypes None -geometry 1366x768 && ./noVNC/utils/novnc_proxy --vnc localhost:5901 --listen 0.0.0.0:7860