* Improve error feedback for duplicate deploy keys
Instead of a generic HTTP 500 error page, a flash message is rendered
with the deploy key page template so inform the user that a key with the
intended title already exists.
* API returns 422 error when key with name exists
* Add email validity checking
Add email validity checking for the following routes:
[Web interface]
1. User registration
2. User creation by admin
3. Adding an email through user settings
[API]
1. POST /admin/users
2. PATCH /admin/users/:username
3. POST /user/emails
* Add further tests
* Add signup email tests
* Add email validity check for linking existing account
* Address PR comments
* Remove unneeded DB session
* Move email check to updateUser
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
* improve integration test to resue models/fixtures and store git repos with source
* use gitea-integration-meta dir instead .tar.gz and cleanup every before every test
* fix import package name
* Add integration test for signup
* Remove unused functions
* Refactoring
* Add repo_create_test.go
* Rollback the incomplete repo create test
* Comply with linter requirements and simplify the code a little bit
