renovate(role): introduce first basic Renovate role

Sets up Renovate using Docker and systemd service and timer to run
regularly.
Also add accompanying host group and playbook play.

roles/renovate/README.md

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+# Role `renovate`
+
+A role for setting up [Renovate](https://docs.renovatebot.com/).
+
+## Supported Distributions
+
+Should work on Debian-based distributions.
+
+## Required Arguments
+
+- `renovate__config`: The Renovate config to deploy.

roles/renovate/files/renovate.service

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+[Unit]
+Description=renovate
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/docker run --rm \
+    -v "/etc/renovate/config.js:/usr/src/app/config.js" \
+    renovate/renovate

roles/renovate/files/renovate.timer

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+[Unit]
+Description=renovate running every 15 minutes
+
+[Timer]
+OnCalendar=*-*-* *:00,15,30,45:00
+
+[Install]
+WantedBy=timers.target

roles/renovate/handlers/main.yaml

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+- name: systemd daemon reload
+  ansible.builtin.systemd_service:
+    daemon_reload: true
+  become: true

roles/renovate/meta/argument_specs.yaml

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+argument_specs:
+  main:
+    options:
+      renovate__config:
+        type: str
+        required: true

roles/renovate/meta/main.yaml

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+---
+dependencies:
+  - role: docker

roles/renovate/tasks/main.yaml

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+- name: ensure renovate config directory exists
+  ansible.builtin.file:
+    path: /etc/renovate
+    state: directory
+    owner: root
+    group: root
+    mode: "0755"
+  become: true
+
+- name: ensure renovate config
+  ansible.builtin.copy:
+    content: "{{ renovate__config }}"
+    dest: /etc/renovate/config.js
+    owner: root
+    group: root
+    mode: "0640"
+  become: true
+
+- name: ensure systemd service exists
+  ansible.builtin.copy:
+    src: renovate.service
+    dest: /etc/systemd/system/renovate.service
+    owner: root
+    group: root
+    mode: "0644"
+  become: true
+  notify:
+    - systemd daemon reload
+
+- name: ensure systemd timer exists
+  ansible.builtin.copy:
+    src: renovate.timer
+    dest: /etc/systemd/system/renovate.timer
+    owner: root
+    group: root
+    mode: "0644"
+  become: true
+  notify:
+    - systemd daemon reload
+
+- name: ensure systemd timer is started and enabled
+  ansible.builtin.systemd_service:
+    name: renovate.timer
+    state: started
+    enabled: true
+  become: true