Add support for serving static files from S3

setup_s3() {

	# https://github.com/humanmade/S3-Uploads

	# https://github.com/dannyvankooten/wp-cdn-loader

	declare -a configs=( "${!S3_ENDPOINT_@}" )

	[[ ${#configs[*]} -gt 0 ]] || return 0

		return

	composer require humanmade/s3-uploads

	composer require dannyvankooten/wp-cdn-loader

	# S3-Uploads looks for vendor/ in the wrong place

	ln -sf /app/vendor wp-content/plugins/s3-uploads/

	wp plugin activate s3-uploads

	wp plugin activate wp-cdn-loader

	S3_STATIC_PREFIX=static/$(wp core version)

	wp config set DVK_CDN_URL ${CDN_URL-${S3_UPLOADS_ENDPOINT}/${S3_STATIC_PREFIX}}

	[[ -v S3_UPLOADS_USE_LOCAL ]] &&

		wp config set S3_UPLOADS_USE_LOCAL true --raw

		--relative \

		--times \

		. static/

	unset IFS

	if wp config has S3_UPLOADS_BUCKET_URL; then

		# Use associative arrays as the closest to sets available

		declare -A UPLOADED=() NEED_UPLOAD=()

		local name

		# Build a set of uploaded files

		for name in $(wp s3-uploads ls ${S3_STATIC_PREFIX}); do

			UPLOADED+=( [$name]= )

		done

		_check_name() {

			[[ ! -f $1 || -v UPLOADED[${1#static/}] ]] && return

			local dir curdir=${1%/*}

			for dir in "${!NEED_UPLOAD[@]}"; do

				[[ $curdir =~ ^$dir ]] && return

				[[ $dir =~ ^$curdir ]] && unset 'NEED_UPLOAD[$dir]'

			done

			NEED_UPLOAD+=( [$curdir]= )

		}

		# Build a set of directories that need syncing to get all missing files

		for name in static/**; do

			_check_name $name

		done

		# Upload the needed directories

		for name in "${!NEED_UPLOAD[@]}"; do

			wp s3-uploads upload-directory "$name" "${S3_STATIC_PREFIX}/${name#static/}" --verbose

		done

	fi

}

next_cron()