alpine/base/Dockerfile

# syntax = docker/dockerfile:1
FROM alpine:edge
USER root

# Exempt from image pruning
LABEL prune="do_not_delete"

# Build ARG for additional packages to install (eg, openssh)
ARG addpkg

# Build ARG: use "root" for debugging
ARG debug

# Copy app folder
COPY app /app

# Install noVNC
RUN printf '%s\n' 'https://dl-cdn.alpinelinux.org/alpine/edge/main/' \
    'https://dl-cdn.alpinelinux.org/alpine/edge/community/' \
    'https://dl-cdn.alpinelinux.org/alpine/edge/testing/' >/etc/apk/repositories \
    && apk update \
    && apk upgrade \
    && apk add --no-cache ${addpkg} \
        doas \
        bash bash-completion \
        novnc websockify \
        nginx \
    && adduser -s /bin/bash -D user \
    && printf '%s\n' 'permit nopass user as root cmd /usr/sbin/nginx' >/etc/doas.conf \
    && passwd -l root >/dev/null 2>&1 \
    && sed '/^http {/a\ \
   include /app/nginx/\*.conf;\n\ \
   types_hash_max_size 4096;\n\ \
   server_names_hash_bucket_size 128;\n' -i /etc/nginx/nginx.conf \
    && mkdir -p /app/nginx /app/logs \
    && chown -R user /app /usr/share/novnc/

# Default environment
USER ${debug:-user}
WORKDIR /home/user
ENV HOME=/home/user
ENV DISPLAY=:0
ENV SHELL=/bin/bash
ENV PS1="[\u@\h \W \$?]\$ "

# Expose nginx port for VNC webui
EXPOSE 6900

# Docker entrypoint
ENTRYPOINT ["/app/entrypoint"]