add linting and security checking for gitlab ci

docker/gitlab/README.md

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+# GitLab Docker Setup
+
+This directory contains the necessary files to set up GitLab using Docker
+and Docker Compose. The setup includes a `gitlab.yaml` file that defines the
+GitLab service configuration.
+
+## Adding gitlab runner as docker container
+
+To add a GitLab runner as a Docker container, follow these steps:
+
+1. SSH into the target machine where you want to run the GitLab runner.
+2. Make sure Docker and Docker Compose are installed on the machine.
+3. Obtain the GitLab runner registration token from your GitLab instance.
+   You can find this token in the GitLab web interface under
+   `Settings > CI/CD > Runners > Create Instance Runner > Registration Token`.
+4. Then run the following command to start the GitLab runner container. There
+   can be multiple gitlab runners commisioned the same way by changing the name
+   of the container.
+
+   ```bash
+   docker volume create gitlab-runner-config-2
+   docker run -d \
+   --name gitlab-runner-2 \
+   --restart always \
+   -v gitlab-runner-config-2:/etc/gitlab-runner \
+   -v /var/run/docker.sock:/var/run/docker.sock \
+   gitlab/gitlab-runner:latest
+
+
+   docker exec -it gitlab-runner-2 \
+   gitlab-runner register \
+   --non-interactive \
+   --url "https://<gitlab_instance_url>/" \
+   --token "<gitlab-runner-registration-token>" \
+   --executor "docker" \
+   --docker-image alpine:latest \
+   --description "docker-runner 2"
+   ```
+
+## Troubleshooting
+
+- If the URL returns a 404 error, it is usually gitlab container takes long time
+  to start. Please wait for few minutes and try again. If the problem persists,
+  check the traefik labels and access logs for more information.
+
+- The initial root password is set in the `gitlab.yaml` file under the
+  `GITLAB_ROOT_PASSWORD` environment variable. Make sure to change it to a
+  secure password after the first login. If for some reason it does not work.
+  You can reset it via the following commands:
+
+  1. Access the GitLab container's shell:
+     ```
+     docker exec -it <gitlab_container_name> /bin/bash
+     ```
+  2. Run the following command to reset the root password:
+     ```
+     gitlab-rails console
+     ```
+  3. In the Rails console, execute the following commands:
+     ```ruby
+     user = User.find_by_username('root')
+     user.password = 'NewSecurePassword123!'
+     user.password_confirmation == 'NewSecurePassword123!'
+     user.save!
+     ```
+  4. Exit the Rails console and the container shell.
+
+- If while disabling signup you get server (500) error, please follow the below
+  steps:
+  1. Access the GitLab container's shell:
+     ```
+     docker exec -it <gitlab_container_name> /bin/bash
+     ```
+  2. Run the following command to open the Rails console:
+     ```
+     gitlab-rails console
+     ```
+  3. In the Rails console, execute the following command to disable user signup:
+     ```ruby
+     settings = ApplicationSetting.last
+     settings.update_column(:runners_registration_token_encrypted, nil)
+     ```
+  4. Exit the Rails console and the container shell.

docker/gitlab/gitlab.yaml

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+services:
+  gitlab:
+    image: gitlab/gitlab-ce:18.5.5-ce.0
+    container_name: gitlab
+    restart: unless-stopped
+    env_file:
+      - ./.env
+    hostname: gitlab.${DOMAINNAME}
+    ports:
+      - "2424:22"
+    volumes:
+      - "$GITLAB_HOME/config:/etc/gitlab"
+      - "$GITLAB_HOME/logs:/var/log/gitlab"
+      - "$GITLAB_HOME/data:/var/opt/gitlab"
+    shm_size: "256m"
+    networks:
+      - t3_proxy
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.gitlab-rtr.entrypoints=websecure"
+      - "traefik.http.routers.gitlab-rtr.rule=Host(`gitlab.${DOMAINNAME}`)"
+      - "traefik.http.routers.gitlab-rtr.tls=true"
+      - "traefik.http.routers.gitlab-rtr.service=gitlab-svc"
+      - "traefik.http.services.gitlab-svc.loadbalancer.server.port=80"
+    environment:
+      GITLAB_ROOT_PASSWORD: ${GITLAB_ROOT_PASSWORD}
+      GITLAB_OMNIBUS_CONFIG: |
+        external_url "https://gitlab.${DOMAINNAME}"
+        gitlab_rails['gitlab_shell_ssh_port'] = 2424
+        letsencrypt['enable'] = false
+        nginx['listen_port']  = 80
+        nginx['listen_https'] = false
+        postgresql['shared_buffers'] = '256MB'
+        sidekiq['max_concurrency'] = 4
+        sidekiq['concurrency'] = 1
+        puma['worker_timeout'] = 120
+        puma['worker_processes'] = 1
+        prometheus_monitoring['enable'] = false
+
+networks:
+  t3_proxy:
+    external: true