build: Optimize Dockerfile (#498)

Dockerfile

@@ -1,10 +1,14 @@
 FROM debian:trixie-slim
 
-ARG DEBCONF_NOWARNINGS "yes"
-ARG DEBIAN_FRONTEND "noninteractive"
-ARG DEBCONF_NONINTERACTIVE_SEEN "true"
+ARG VERSION_ARG="0.0"
+ARG VERSION_VNC="1.4.0"
 
-RUN apt-get update && \
+ARG DEBCONF_NOWARNINGS="yes"
+ARG DEBIAN_FRONTEND="noninteractive"
+ARG DEBCONF_NONINTERACTIVE_SEEN="true"
+
+RUN set -eu && \
+    apt-get update && \
     apt-get --no-install-recommends -y install \
         tini \
         wget \
@@ -22,21 +26,19 @@ RUN apt-get update && \
         netcat-openbsd \
         qemu-system-x86 && \
     apt-get clean && \
-    novnc="1.4.0" && \
     mkdir -p /usr/share/novnc && \
-    wget https://github.com/novnc/noVNC/archive/refs/tags/v"$novnc".tar.gz -O /tmp/novnc.tar.gz -q && \
+    wget "https://github.com/novnc/noVNC/archive/refs/tags/v${VERSION_VNC}.tar.gz" -O /tmp/novnc.tar.gz -q --timeout=10 && \
     tar -xf /tmp/novnc.tar.gz -C /tmp/ && \
-    cd /tmp/noVNC-"$novnc" && \
+    cd "/tmp/noVNC-${VERSION_VNC}" && \
     mv app core vendor package.json *.html /usr/share/novnc && \
     unlink /etc/nginx/sites-enabled/default && \
     sed -i 's/^worker_processes.*/worker_processes 1;/' /etc/nginx/nginx.conf && \
+    echo "$VERSION_ARG" > /run/version && \
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-COPY ./src /run/
-COPY ./web /var/www/
-
-RUN chmod +x /run/*.sh
-RUN mv /var/www/nginx.conf /etc/nginx/sites-enabled/web.conf
+COPY --chmod=755 ./src /run/
+COPY --chmod=755 ./web /var/www/
+COPY --chmod=744 ./web/nginx.conf /etc/nginx/sites-enabled/web.conf
 
 VOLUME /storage
 EXPOSE 22 5900 8006
@@ -46,7 +48,4 @@ ENV RAM_SIZE "1G"
 ENV DISK_SIZE "16G"
 ENV BOOT "http://example.com/image.iso"
 
-ARG VERSION_ARG "0.0"
-RUN echo "$VERSION_ARG" > /run/version
-
 ENTRYPOINT ["/usr/bin/tini", "-s", "/run/entry.sh"]