Fix script compatiable with OpenWrt (#19000)
* Fix compatibility of upgrade.sh in openwrt and add service init script for openwrt.
* Apply suggestions from code review
Co-authored-by: Gusted <williamzijl7@hotmail.com>
Co-authored-by: zeripath <art27@cantab.net>
* Update contrib/upgrade.sh
Co-authored-by: Norwin <noerw@users.noreply.github.com>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Gusted <williamzijl7@hotmail.com>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: techknowlogick <matti@mdranta.net>
Co-authored-by: Norwin <noerw@users.noreply.github.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
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