Added draft for mariadb docker role

roles/docker-mariadb/README.md

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+# MariaDB Docker Ansible Role
+
+## Overview
+This Ansible role facilitates the deployment of a MariaDB server using Docker. It is designed to ensure ease of installation and configuration, with the flexibility to adapt to different environments.
+
+## Features
+- **Dockerized MariaDB**: Leverages Docker for MariaDB deployment, ensuring consistency across different environments.
+- **Customizable Settings**: Allows customization of the MariaDB instance through various Ansible variables.
+- **Network Configuration**: Includes setup of a dedicated Docker network for MariaDB.
+- **Idempotent Design**: Ensures that repeat runs of the playbook do not result in unwanted changes.
+- **Security Focused**: Implements best practices for securing the MariaDB root password.
+
+## Prerequisites
+Before using this role, ensure you have the following:
+- Ansible installed on the control machine.
+- Docker installed on the target host(s).
+- Access to the target host(s) via SSH.
+
+## Configuration
+Configure the role by setting the required variables. These can be set in the playbook or in a separate variable file:
+- `central_mariadb_root_password`: The root password for the MariaDB server.
+- `database_databasename`: The name of the initial database to create.
+- `database_username`: The username for the database user.
+- `database_password`: The password for the database user.
+
+## Contributing
+Contributions to this project are welcome. Please submit issues and pull requests with your suggestions.

roles/docker-mariadb/handlers/main.yml

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+- name: create database
+  mysql_db:
+    name: "{{database_databasename}}"
+    state: present
+    login_user: root
+    login_password: "{{central_mariadb_root_password}}"
+    login_host: 127.0.0.1
+    login_port: 3306
+  listen: create database
+
+- name: create database user
+  mysql_user:
+    name: "{{database_username}}"
+    password: "{{database_password}}"
+    priv: '{{database_databasename}}.*:ALL'
+    state: present
+    login_user: root
+    login_password: "{{central_mariadb_root_password}}"
+    login_host: 127.0.0.1
+    login_port: 3306
+  listen: create database

roles/docker-mariadb/tasks/main.yml

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+- name: Create Docker network for MariaDB
+  docker_network:
+    name: mariadb_network
+    state: present
+  when: run_once_backup_docker_to_local is not defined
+
+- name: install MariaDB
+  docker_container:
+    name: mariadb
+    image: mariadb:latest
+    detach: yes
+    env:
+      MARIADB_ROOT_PASSWORD: "{{central_mariadb_root_password}}"
+    networks:
+      - name: mariadb_network
+    published_ports:
+      - "127.0.0.1:3306:3306"
+  when: run_once_backup_docker_to_local is not defined
+
+- name: run the docker_mariadb tasks once
+  set_fact:
+    run_once_backup_docker_to_local: true
+  when: run_once_backup_docker_to_local is not defined