Merge branch '342724-document-openshift-compatibility-on-a-separate-page' into 'master'

Resolve "Document OpenShift compatibility on  a separate page"

See merge request gitlab-org/gitlab!72011

doc/install/openshift_and_gitlab/index.md

 ---
-redirect_to: 'https://docs.gitlab.com/charts/installation/operator.html'
-remove_date: '2022-09-22'
+stage: Enablement
+group: Distribution
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
 ---
 
-This file was moved to [another location](https://docs.gitlab.com/charts/installation/operator.html).
+# OpenShift support
 
-<!-- This redirect file can be deleted after <2022-09-22>. -->
-<!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->
+OpenShift - GitLab compatibility can be addressed in three different aspects. This page helps navigating between these aspects and provides introductory information for getting started with OpenShift and GitLab.
+
+## What is OpenShift
+
+OpenShift helps you to develop, deploy, and manage container-based applications. It provides you with a self-service platform to create, modify, and deploy applications on demand, thus enabling faster development and release life cycles.
+
+## Use OpenShift to run GitLab Self-Managed
+
+Running GitLab within an OpenShift cluster is officially supported using the GitLab Operator. You can learn more on
+[setting up GitLab on OpenShift on the GitLab Operator's documentation](https://docs.gitlab.com/charts/installation/operator.html).
+Some components (documented on the GitLab Operator doc) are not supported yet.
+
+## Deploy to and integrate with OpenShift from GitLab
+
+Deploying custom or COTS applications on top of OpenShift from GitLab is supported using [the GitLab Kubernetes Agent](../../user/clusters/agent/index.md).
+
+## Use OpenShift to run a GitLab Runner Fleet
+
+The GitLab Operator does not include the GitLab Runner. To install and manage a GitLab Runner fleet in an OpenShift cluster, use the
+[GitLab Runner Operator](https://gitlab.com/gitlab-org/gl-openshift/gitlab-runner-operator).
+
+## Unsupported GitLab features
+
+### Docker-in-Docker
+
+When using OpenShift to run a GitLab Runner Fleet, we do not support some GitLab features given OpenShift's security model.
+Features requiring Docker-in-Docker might not work.
+
+For Auto DevOps, the following features are not supported yet:
+
+- Auto Code Quality
+- Auto License Compliance
+- Auto Browser Performance Testing
+- Auto Build
+
+For Auto Build, there's a [possible workaround using `kaniko`](../../ci/docker/using_kaniko.md).
+You can check the progress of the implementation in this [issue](https://gitlab.com/gitlab-org/gitlab/-/issues/332560).