Add GitLab runner definition

roles/runner/handlers/main.yml

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+- name: restart_docker
+  service:
+    name: docker
+    state: restarted

roles/runner/tasks/main.yml

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+- name: Install Docker dependencies
+  apt:
+    name: [ 'ca-certificates', 'curl', 'gnupg', 'lsb-release' ]
+    state: latest
+    update_cache: yes
+
+- name: Add Docker GPG key
+  apt_key:
+    url: https://download.docker.com/linux/debian/gpg
+    state: present
+
+- name: Add Docker repository
+  apt_repository:
+    repo: deb https://download.docker.com/linux/debian buster stable
+    state: present
+
+- name: Install Docker
+  apt:
+    name: [ 'docker-ce', 'docker-ce-cli', 'containerd.io' ]
+    state: latest
+    update_cache: yes
+
+- name: Start Docker
+  service:
+    name: docker
+    state: started
+    enabled: yes
+
+- name: Add GitLab repository
+  shell:
+    cmd: curl -L https://packages.gitlab.com/install/repositories/runner/gitlab-runner/script.deb.sh | bash
+    creates: /etc/apt/sources.list.d/runner_gitlab-runner.list
+
+- name: Pin gitlab-runner package
+  copy:
+    dest: /etc/apt/preferences.d/pin-gitlab-runner.pref
+    content: |
+      Explanation: Prefer GitLab provided packages over the Debian native ones
+      Package: gitlab-runner
+      Pin: origin packages.gitlab.com
+      Pin-Priority: 1001
+
+- name: Install GitLab Runner
+  apt:
+    name: gitlab-runner
+    state: latest
+    update_cache: yes
+
+- name: Register runner with GitLab
+  command: 
+    cmd: >
+      gitlab-runner register
+      --non-interactive
+      --url "https://git.vimium.com"
+      --executor "docker"
+      --docker-image alpine:latest
+      --description "docker-runner"
+      --tag-list "docker,hetzner"
+      --run-untagged="true"
+      --locked="false"
+      --access-level="not_protected"
+      --registration-token '{{ gitlab_runner_registration_token }}' && touch /etc/gitlab-runner-registered
+    creates: /etc/gitlab-runner-registered
+  no_log: true