Add support for enabling the Gitlab WAF in ingress-nginx

What does this MR do?

Add support for enabling the Gitlab WAF in ingress-nginx

This fixes #11 (closed)

Currently installing the Gitlab WAF is only able to be done via Gitlab Managed Apps v1, in the Gitlab UI.

This commit allows you to enable the Gitlab WAF in Gitlab Managed Apps v2. In order to enable the WAF, you need to add the following to your .gitlab/managed-apps/config.yaml file in your cluster management project.

ingress:
  installed: true
  gitlab_waf:
    installed: true

By default the WAF is set to DetectionOnly, however, if you wish to set it to blocking, you can add the following to your .gitlab/managed-apps/config.yaml

ingress:
  gitlab_waf:
    modsecurity_mode_blocking: true

Screenshots

Manual QA

• Test this change using a Cluster management project