Fix rootfs location and update s6

docker/rootfs/usr/bin/common.sh

@@ -0,0 +1,65 @@
+#!/bin/bash
+
+set -e
+
+CYAN='\E[1;36m'
+BLUE='\E[1;34m'
+YELLOW='\E[1;33m'
+RED='\E[1;31m'
+RESET='\E[0m'
+export CYAN BLUE YELLOW RED RESET
+
+PUID=${PUID:-0}
+PGID=${PGID:-0}
+
+NPMUSER=npm
+NPMGROUP=npm
+NPMHOME=/tmp/npmuserhome
+export NPMUSER NPMGROUP NPMHOME
+
+if [[ "$PUID" -ne '0' ]] && [ "$PGID" = '0' ]; then
+	# set group id to same as user id,
+	# the user probably forgot to specify the group id and
+	# it would be rediculous to intentionally use the root group
+	# for a non-root user
+	PGID=$PUID
+fi
+
+export PUID PGID
+
+log_info () {
+	echo -e "${BLUE}❯ ${CYAN}$1${RESET}"
+}
+
+log_warn () {
+	echo -e "${BLUE}❯ ${YELLOW}WARNING: $1${RESET}"
+}
+
+log_error () {
+	echo -e "${RED}❯ $1${RESET}"
+}
+
+log_fatal () {
+	echo -e "${RED}--------------------------------------${RESET}"
+	echo -e "${RED}ERROR: $1${RESET}"
+	echo -e "${RED}--------------------------------------${RESET}"
+	/run/s6/basedir/bin/halt
+	exit 1
+}
+
+# param $1: group_name
+get_group_id () {
+	if [ "${1:-}" != '' ]; then
+		getent group "$1" | cut -d: -f3
+	fi
+}
+
+# param $1: value
+is_true () {
+	VAL=$(echo "${1:-}" | tr '[:upper:]' '[:lower:]')
+	if [ "$VAL" == 'true' ] || [ "$VAL" == 'on' ] || [ "$VAL" == '1' ] || [ "$VAL" == 'yes' ]; then
+		echo '1'
+	else
+		echo '0'
+	fi
+}

docker/rootfs/usr/bin/healthcheck.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+set -euf -o pipefail
+
+HEALTHY="$(curl --silent "http://127.0.0.1:3000/api" | jq --raw-output '.result.healthy')"
+
+echo "Healthy: ${HEALTHY}"
+[ "$HEALTHY" = 'true' ] || exit 1