v1.15.6

* BUGFIXES
  * Prevent panic in serv.go with Deploy Keys (#17434) (#17435)
  * Fix CSV render error (#17406) (#17431)
  * Read expected buffer size (#17409) (#17430)
  * Ensure that restricted users can access repos for which they are members (#17460) (#17464)
  * Make commit-statuses popup show correctly (#17447) (#17466)
* TESTING
  * Add integration tests for private.NoServCommand and private.ServCommand (#17456) (#17463)
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