The security fix that quoted `$APP` inside the pre-receive hook heredoc changed the literal hook contents from `dokku git-hook foo` to `dokku git-hook "foo"`, so the existing substring assertions no longer match.
The security fix that quoted `$APP` inside the pre-receive hook heredoc changed the literal hook contents from `dokku git-hook foo` to `dokku git-hook "foo"`, so the existing substring assertions no longer match.