- Add mail interceptor the signs outgoing email with SMIME
- Add lib and helpers to work with SMIME data
- New configuration params for setting up SMIME key and cert files

A nonce-based Content-Security-Policy thwarts XSS attacks by allowing
inline JavaScript to execute if the script nonce matches the header
value. Rails 5.2 supports nonce-based Content-Security-Policy headers,
so provide configuration to enable this and make it work.

To support this, we need to change all `:javascript` HAML filters to the
following form:

```
= javascript_tag nonce: true do
  :plain
    ...
```

We use `%script` throughout our HAML to store JSON and other text, but
since this doesn't execute, browsers don't appear to block this content
from being used and require the nonce value to be present.

Introducing Docker Registry replication

This is the first part of Docker Registry replication
    for secondary Geo node.

Instead return error objects.

This copies over EE-specific changes to shared configuration files in
CE.

https://community.atlassian.com/t5/Jira-questions/Is-it-quot-JIRA-quot-or-quot-Jira-quot/qaq-p/681163

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

To make this happen, we need to conditionally add the group_saml
strategy when running tests, but only on EE. This requires some changes
to Gitlab.ee? so that it can be used before/without loading the Rails
environment. We also have to change how we require a few files, so this
can run outside of Rails.

This sampler gathers Puma-specific metrics which can be used by
Prometheus then.