WIP: When file not found, possibly redirect to GitLab for acme challenge

Vladimir Shushlinrequested to merge
letsencrypt-poc into master

In case the file is not found, check the path if it is the Let's Encrypt acme challenge path. And if so, redirect to gitlab-rails so it can serve it from the database.

This redirect should only happen when a custom domain is visited, not the generic GitLab Pages domain. And also HTTP only, no HTTPS.

Closes #165 (closed)

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