Hello sir,
This pull request solves issue #23949
I have updated the upgrade script such that it will check if the Gitea
service is running, if it's not running then it will exit the process
and if it's running then the process will move further ahead.
Thank You.

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Co-authored-by: Giteabot <teabot@gitea.io>
Co-authored-by: silverwind <me@silverwind.io>

The upgrade script has to deal with redirects due to pointing to former
CDN, this reduces HTTP calls by 2

setting as skip-changelog, due to it being a contrib script

* Fix scirpt err with `su -c`, add env auto loading.

* Update upgrade.sh

* Update upgrade.sh

* Update contrib/upgrade.sh

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

* fix idempotency of script (eg when aborting the downloads)
* improve readability (user facing variables first, definitions next, statements last)
* improve dependency checks
* fix ignored $giteaversion variable
* more logging
* print usage string on incorrect usage

* 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>

Adds an upgrade script that automates upgrading installations on Linux from binary releases, so people don't need to reinvent the wheel. Hopefully this leads to less questions about how to upgrade, and consequently less Gitea instances running unmaintained versions in the wild.

Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: Gusted <williamzijl7@hotmail.com>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: 6543 <6543@obermui.de>