feat(kb/gitlab): start article about gitlab cli

knowledge base/gitlab/README.md

@@ -828,6 +828,7 @@ Solution: set the correct ownership with
 - [Upgrade Path tool]
 - [Elasticsearch]
 - [CODEOWNERS syntax]
+- [GitLab CLI][glab]
 
 ### Sources
 
@@ -871,6 +872,7 @@ Solution: set the correct ownership with
 
 <!-- Knowledge base -->
 [buildah]: ../buildah.md
+[glab]: glab.md
 [kaniko]: ../kaniko.md
 [self-hosting]: ../self-hosting.md
 

knowledge base/gitlab/glab.md

@@ -0,0 +1,93 @@
+# GitLab CLI
+
+The `glab` utility is a CLI tool for GitLab.
+
+Available for repositories hosted on GitLab.com, GitLab Dedicated, and GitLab Self-Managed.<br/>
+Supports multiple authenticated GitLab instances.<br/>
+Automatically detects the authenticated hostname from the remotes available in one's working Git directory.
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+
+## TL;DR
+
+<details>
+  <summary>Setup</summary>
+
+```sh
+# Install.
+brew install 'glab'
+
+# Start interactive configuration.
+glab auth login
+
+# Load shell completions.
+glab completion -s 'fish' > "$HOME/.config/fish/completions/glab.fish"
+source <(glab completion -s 'bash')
+```
+
+Global configuration file: `~/.config/glab-cli/config.yml`.<br/>
+Repository-specific configuration file: `.git/glab-cli/config.yml`<br/>
+They contain tokens in plaintext.
+
+</details>
+
+<details>
+  <summary>Usage</summary>
+
+```sh
+# Get help.
+glab --help
+glab user --help
+glab release view --help
+
+# Make changes to the configuration.
+glab config edit
+glab config edit --local
+glab config set 'host' 'gitlab.example.org' --global
+glab config set 'git_protocol' 'ssh' --host 'gitlab.example.org'
+glab config set 'api_protocol' 'https' -h 'gitlab.example.org'
+glab config set 'editor' 'vim'
+glab config set 'token' 'xxxxx' -h 'gitlab.com'
+glab config set 'check_update' 'false' --global
+
+# Clone repositories.
+glab repo clone 'someGroup/someRepo'
+
+# List issues.
+glab issues list
+glab issues list --repo 'someGroup/someNamespace/someRepo'
+
+# List Merge Requests.
+glab mr list
+glab mr list --repo 'someGroup/someNamespace/someRepo'
+```
+
+</details>
+
+<!-- Uncomment if used
+<details>
+  <summary>Real world use cases</summary>
+
+```sh
+```
+
+</details>
+-->
+
+## Further readings
+
+- [Codebase]
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+<!-- Files -->
+<!-- Upstream -->
+[codebase]: https://gitlab.com/gitlab-org/cli
+
+<!-- Others -->