Optimize build parameters

i3/i3.sh

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+## Dockerfile
+cat >Dockerfile <<- 'Dockerfile'
+# syntax = docker/dockerfile:1.2
+FROM myvnc/base
+USER root
+
+# X session environment variable
+ENV STARTXBIN i3
+
+# Install packages
+RUN --mount=type=cache,sharing=locked,target=/var/cache/pacman \
+    pacman -Syu --ask 4 --needed \
+    tigervnc \
+    i3-wm ttf-dejavu \
+    && pacman -Scc --ask 4
+
+# i3
+COPY 10-tigervnc.sh 90-tigervnc.sh /app/init.d/
+RUN chmod +x /app/init.d/*
+
+# Reset user home directory
+USER user
+WORKDIR /home/user
+Dockerfile
+
+## i3/tigervnc Setup
+cat >10-tigervnc.sh <<- '10-tigervnc.sh'
+#!/usr/bin/env bash
+# Check for MYVNC_VNCPASS variable
+if [ -z ${MYVNC_VNCPASS} ]
+then
+    echo "MYVNC_VNCPASS env variable is missing"
+    exit 1
+fi
+
+# Configure tigervnc auth
+if [ ! -f ~/.vnc/passwd ]
+then
+    echo "${MYVNC_VNCPASS}" | vncpasswd -f >~/.vnc/passwd
+    chmod 0600 ~/.vnc/passwd
+fi
+
+# Remove VNCPASS env
+unset MYVNC_VNCPASS
+
+# VNC xstartup
+install /dev/stdin ~/.vnc/xstartup <<- xstartup
+#!/usr/bin/env bash
+unset SESSION_MANAGER
+unset DBUS_SESSION_BUS_ADDRESS
+exec ${STARTXBIN}
+xstartup
+
+# Turn vnc sharing on/off
+if [[ ${MYVNC_VNCSHARING} == "true" ]] || [[ ${MYVNC_VNCSHARING} == "1" ]]
+then
+    _MYVNC_VNCSHARING=alwaysshared
+else
+    _MYVNC_VNCSHARING=nevershared
+fi
+
+# VNC config
+cat >~/.vnc/config <<- vncconfig
+session=i3
+geometry=1920x1080
+framerate=60
+depth=32
+${_MYVNC_VNCSHARING}
+vncconfig
+
+# i3 preferences
+mkdir -p ~/.config/i3/config.d
+cat >~/.config/i3/config <<- 'i3config'
+# Font
+font pango:DejaVu Sans Mono 8
+
+# Include custom config
+include ~/.config/i3/config.d/*.conf
+
+# Binds for killing application
+bindsym Mod1+Mod4+Shift+q kill
+bindsym Mod1+Mod4+Shift+f fullscreen toggle
+
+# Binds for cycling workspaces
+bindsym Mod1+Mod4+Shift+Right workspace next
+bindsym Mod1+Mod4+Shift+Left workspace prev
+
+# Locked mode
+mode locked {
+    bindsym Mod4+Mod1+Escape mode default
+}
+bindsym Mod4+Mod1+Escape mode locked
+
+# Hide bar permanently
+exec --no-startup-id i3-msg bar mode invisible
+
+# Always open window in fullscreen
+for_window [all] fullscreen enable
+for_window [all] border none
+default_border none
+
+# Execute startup script for webapp
+exec --no-startup-id /usr/bin/bash ~/.config/i3/startapp.sh
+i3config
+10-tigervnc.sh
+
+## TigerVNC launch script
+cat >90-tigervnc.sh <<- '90-tigervnc.sh'
+#!/usr/bin/env bash
+# Launch Tigervnc
+/usr/bin/dbus-launch vncserver :0 &
+90-tigervnc.sh
+
+## Docker build
+DOCKER_BUILDKIT=1 docker build ./. \
+    --tag myvnc/base:i3 \
+    && rm -f Dockerfile *.sh