needed to fix issue as described in #10280

* rename check-db to check-db-version
* add check-db-consistency:
* find issues without existing repository
* find pulls without existing issues
* find tracked times without existing issues/pulls
* find labels without repository or org reference

Co-authored-by: guillep2k <18600385+guillep2k@users.noreply.github.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Add `gitea doctor --list` flag to list the checks that will be run, including those by default
* Add `gitea doctor --run` to run specific checks
* Add `gitea doctor --all` to run all checks
* Add db version checker
* Add non-default recalculate merge bases check/fixer to doctor
* Add hook checker (Fix #9878) and ensure hooks are executable (Fix #6319)
* Fix authorized_keys checker - slight change of functionality here because parsing the command is fragile and we should just check if the authorized_keys file is essentially the same as what gitea would produce. (This is still not perfect as order matters - we should probably just md5sum the two files.)
* Add SCRIPT_TYPE check (Fix #10977)
* Add `gitea doctor --fix` to attempt to fix what is possible to easily fix
* Add `gitea doctor --log-file` to set the log-file, be it a file, stdout or to switch off completely. (Fixes previously undetected bug with certain xorm logging configurations - see @6543 comment.)

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Add doctor check of app.ini paths

* Make /custom dir not mandatory

* Fix message and improve interface

* Update cmd/doctor.go

Co-Authored-By: John Olheiser <42128690+jolheiser@users.noreply.github.com>

* Apaise lint

* Isn't the linter a sweet? (1)

* Isn't the linter a sweet? (2)

* Isn't the linter a sweet?? (3)

* Restart CI

Co-authored-by: John Olheiser <42128690+jolheiser@users.noreply.github.com>
Co-authored-by: zeripath <art27@cantab.net>

* add doctor

* Add a new command doctor to check if some wrong configurations on gitea instance

* fix import

* use regex match authorized_keys on doctor

* Add documentation