feat: add README

src/gitlab/README.md

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+# GitLab
+
+[English](./README.md) | [中文](./README.zh.md)
+
+This service sets up a GitLab service.
+
+## Configuration
+
+Edit the `config/gitlab.rb` file and add the following content:
+
+```ruby
+external_url 'http://my-server.local:5080'
+nginx['listen_port'] = 5080
+gitlab_rails['gitlab_ssh_host'] = 'my-server'
+gitlab_rails['gitlab_shell_ssh_port'] = 5022
+```
+
+## Services
+
+- `gitlab`: The GitLab service.
+
+## Ports
+
+- `5443:443` (HTTPS)
+- `5080:80` (HTTP)
+- `5022:22` (SSH)
+
+## Volumes
+
+- `config`: A volume for storing GitLab configuration.
+- `logs`: A volume for storing GitLab logs.
+- `data`: A volume for storing GitLab data.

src/gitlab/README.zh.md

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+# GitLab
+
+[English](./README.md) | [中文](./README.zh.md)
+
+此服务用于搭建一个 GitLab 服务。
+
+## 配置
+
+编辑 `config/gitlab.rb` 文件，添加以下内容：
+
+```ruby
+external_url 'http://my-server.local:5080'
+nginx['listen_port'] = 5080
+gitlab_rails['gitlab_ssh_host'] = 'my-server'
+gitlab_rails['gitlab_shell_ssh_port'] = 5022
+```
+
+## 服务
+
+- `gitlab`: GitLab 服务。
+
+## 端口
+
+- `5443:443` (HTTPS)
+- `5080:80` (HTTP)
+- `5022:22` (SSH)
+
+## 卷
+
+- `config`: 用于存储 GitLab 配置的卷。
+- `logs`: 用于存储 GitLab 日志的卷。
+- `data`: 用于存储 GitLab 数据的卷。

src/gitlab/docker-compose.yaml

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+services:
+  gitlab:
+    image: gitlab/gitlab-ce:17.10.4-ce.0
+    container_name: gitlab
+    restart: unless-stopped
+    ports:
+      - "5443:443"
+      - "5080:80"
+      - "5022:22"
+    volumes:
+      - /etc/localtime:/etc/localtime:ro
+      - /etc/timezone:/etc/timezone:ro
+      - ./config:/etc/gitlab
+      - logs:/var/log/gitlab
+      - data:/var/opt/gitlab
+    extra_hosts:
+      - host.docker.internal:host-gateway
+
+volumes:
+  logs:
+  data: