## Dockerfile
cat >Dockerfile <<- 'Dockerfile'
# syntax = docker/dockerfile:1.2
FROM myvnc/base:i3
USER root

# Choose a terminal
ENV TERMINAL=terminator

# install packages
RUN --mount=type=cache,sharing=locked,target=/var/cache/pacman \
    pacman -Syu --ask 4 --needed \
    remmina libvncserver \
    ${TERMINAL} \
    openssh \
    && pacman -Scc --ask 4

# Tigervnc
COPY 20-remmina.sh /app/init.d/
RUN chmod +x /app/init.d/*

# Reset user home directory
USER user
WORKDIR /home/user
Dockerfile

## Remmina setup
cat >20-remmina.sh <<- '20-remmina.sh'
#!/usr/bin/env bash
# Remmina config
cat >~/.config/i3/config.d/remmina.conf <<- 'remmina.conf'
# Open terminal
exec --no-startup-id i3-msg 'workspace "2"; exec /usr/bin/${TERMINAL}'

# Maximize
for_window [class="remmina"] move container to workspace "1"
for_window [class="${TERMINAL}"] move container to workspace "2"
remmina.conf

# Remmina startup
install /dev/stdin ~/.config/i3/startapp.sh <<- startapp.sh
#!/usr/bin/env bash
# Run remmina
while true
do
    /usr/bin/remmina
done
startapp.sh
20-remmina.sh

## Docker build
DOCKER_BUILDKIT=1 docker build ./. \
    --tag myvnc/remmina \
    && rm -f Dockerfile *.sh