feat: add option to add custom unit override options (#5)

Reviewed-on: #5

_docs/index.md

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+---
+title: docker_engine
+type: docs
+---
+
+[![Source Code](https://img.shields.io/badge/gitea-source%20code-blue?logo=gitea&logoColor=white)](https://gitea.rknet.org/ansible/xoxys.docker_engine)
+[![Build Status](https://img.shields.io/drone/build/ansible/xoxys.docker_engine?logo=drone&server=https%3A%2F%2Fdrone.rknet.org)](https://drone.rknet.org/ansible/xoxys.docker_engine)
+[![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](https://gitea.rknet.org/ansible/xoxys.docker_engine/src/branch/main/LICENSE)
+
+Setup docker engine.
+
+<!--more-->
+
+- [Requirements](#requirements)
+- [Default Variables](#default-variables)
+  - [dockerengine_ansible_deps](#dockerengine_ansible_deps)
+  - [dockerengine_daemon_config](#dockerengine_daemon_config)
+  - [dockerengine_daemon_config_extra](#dockerengine_daemon_config_extra)
+  - [dockerengine_docker_group_enabled](#dockerengine_docker_group_enabled)
+  - [dockerengine_http_proxy](#dockerengine_http_proxy)
+  - [dockerengine_https_proxy](#dockerengine_https_proxy)
+  - [dockerengine_networks](#dockerengine_networks)
+  - [dockerengine_networks_extra](#dockerengine_networks_extra)
+  - [dockerengine_no_proxy](#dockerengine_no_proxy)
+  - [dockerengine_nsremap_range_length](#dockerengine_nsremap_range_length)
+  - [dockerengine_nsremap_range_start](#dockerengine_nsremap_range_start)
+  - [dockerengine_nsremap_user](#dockerengine_nsremap_user)
+  - [dockerengine_packages](#dockerengine_packages)
+  - [dockerengine_packages_extra](#dockerengine_packages_extra)
+  - [dockerengine_registries](#dockerengine_registries)
+  - [dockerengine_service](#dockerengine_service)
+  - [dockerengine_service_override_unit](#dockerengine_service_override_unit)
+  - [dockerengine_usernamespace_enabled](#dockerengine_usernamespace_enabled)
+- [Dependencies](#dependencies)
+
+---
+
+## Requirements
+
+- Minimum Ansible version: `2.1`
+
+
+## Default Variables
+
+### dockerengine_ansible_deps
+
+#### Default value
+
+```YAML
+dockerengine_ansible_deps:
+  - cryptography
+  - docker-compose
+  - docker
+```
+
+### dockerengine_daemon_config
+
+#### Default value
+
+```YAML
+dockerengine_daemon_config:
+  - selinux-enabled: false
+  - log-driver: journald
+  - log-level: info
+  - live-restore: true
+```
+
+### dockerengine_daemon_config_extra
+
+#### Default value
+
+```YAML
+dockerengine_daemon_config_extra: []
+```
+
+### dockerengine_docker_group_enabled
+
+#### Default value
+
+```YAML
+dockerengine_docker_group_enabled: false
+```
+
+### dockerengine_http_proxy
+
+#### Default value
+
+```YAML
+dockerengine_http_proxy: _unset_
+```
+
+### dockerengine_https_proxy
+
+#### Default value
+
+```YAML
+dockerengine_https_proxy: _unset
+```
+
+### dockerengine_networks
+
+List of extra docker networks to create. For configuration detials see `docker_networks`.
+
+#### Default value
+
+```YAML
+dockerengine_networks: []
+```
+
+#### Example usage
+
+```YAML
+dockerengine_networks:
+  - name: my_network
+    driver: bridge
+    enable_ipv6: True
+    ipam_config:
+      - subnet: fdd1:ac8c:0557:7ce1::/64
+    force: False
+    state: present
+```
+
+### dockerengine_networks_extra
+
+#### Default value
+
+```YAML
+dockerengine_networks_extra: []
+```
+
+### dockerengine_no_proxy
+
+#### Default value
+
+```YAML
+dockerengine_no_proxy: _unset_
+```
+
+### dockerengine_nsremap_range_length
+
+#### Default value
+
+```YAML
+dockerengine_nsremap_range_length: 65536
+```
+
+### dockerengine_nsremap_range_start
+
+#### Default value
+
+```YAML
+dockerengine_nsremap_range_start: 231072
+```
+
+### dockerengine_nsremap_user
+
+#### Default value
+
+```YAML
+dockerengine_nsremap_user: dockremap
+```
+
+### dockerengine_packages
+
+#### Default value
+
+```YAML
+dockerengine_packages:
+  - docker-ce
+  - docker-ce-cli
+  - containerd.io
+  - docker-buildx-plugin
+  - docker-compose-plugin
+```
+
+### dockerengine_packages_extra
+
+The role requires epel repository and pip to work. You can use
+`dockerengine_packages_extra` to install these dependencys.
+
+#### Default value
+
+```YAML
+dockerengine_packages_extra: []
+```
+
+### dockerengine_registries
+
+List of docker registries to auto login
+
+#### Default value
+
+```YAML
+dockerengine_registries: []
+```
+
+#### Example usage
+
+```YAML
+dockerengine_registries:
+  - registry: myregistry.example.com (optional)
+    username: docker
+    password: secure
+    reauthorize: False
+    state: present
+```
+
+### dockerengine_service
+
+#### Default value
+
+```YAML
+dockerengine_service: docker
+```
+
+### dockerengine_service_override_unit
+
+Multiline string of options to add to the `systemd` service override unit section.
+
+#### Default value
+
+```YAML
+dockerengine_service_override_unit: _unset_
+```
+
+#### Example usage
+
+```YAML
+dockerengine_service_override_unit: |
+  After=time-sync.target
+  Requires=time-sync.target
+```
+
+### dockerengine_usernamespace_enabled
+
+#### Default value
+
+```YAML
+dockerengine_usernamespace_enabled: false
+```
+
+
+
+## Dependencies
+
+None.