Prohibit automatic downgrades

[6543]

close #13107

[6543]

@lafriks added print to stderr too

while testing the backport ... I noticed it wont show up in the terminal - hope It's still fine

[6543]

backport #13111

[lunny]

Or we can add a flag or an environment to force downgrade, but not update the database manually.

[6543]

@lunny did had a quick look, a flag would be a nice optional enhancement, but we have to refactor some code then, so migration functions can have options then ...

gitea/models/migrations/migrations.go

Lines 290 to 291 in 0e4f663

	// Migrate database to current version
	func Migrate(x *xorm.Engine) error {

[codecov-io]

Codecov Report

Merging #13108 into master will decrease coverage by 0.06%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #13108      +/-   ##
==========================================
- Coverage   42.51%   42.45%   -0.07%     
==========================================
  Files         673      673              
  Lines       74116    74118       +2     
==========================================
- Hits        31512    31466      -46     
- Misses      37484    37551      +67     
+ Partials     5120     5101      -19     

Impacted Files	Coverage Δ
models/migrations/migrations.go	2.44% <0.00%> (-0.02%)	⬇️
modules/notification/ui/ui.go	72.22% <0.00%> (-8.34%)	⬇️
models/issue_comment.go	47.62% <0.00%> (-6.13%)	⬇️
modules/notification/mail/mail.go	28.73% <0.00%> (-5.75%)	⬇️
modules/notification/base/null.go	68.57% <0.00%> (-2.86%)	⬇️
modules/notification/notification.go	78.57% <0.00%> (-2.68%)	⬇️
modules/log/event.go	59.90% <0.00%> (-1.89%)	⬇️
services/mailer/mail.go	54.83% <0.00%> (-1.08%)	⬇️
services/pull/pull.go	40.78% <0.00%> (-0.50%)	⬇️
models/error.go	35.36% <0.00%> (+0.50%)	⬆️
... and 6 more

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[6543]

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