Implemented docker postgres draft

roles/docker-postgres/README.md

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+# Docker-Postgres Ansible Role
+
+## Overview
+This Ansible role is designed to deploy a PostgreSQL database using Docker. It includes tasks for setting up a Docker network, installing PostgreSQL in a Docker container, and initializing the database with a specified user and database.
+
+## Role Variables
+- `central_postgres_password`: The password for the PostgreSQL superuser (`postgres`).
+- `database_databasename`: Name of the database to be created.
+- `database_username`: Username for the database user.
+- `database_password`: Password for the database user.
+
+## Role Tasks
+1. **Create Docker network for PostgreSQL**: Sets up a Docker network for PostgreSQL communication.
+2. **Install PostgreSQL**: Deploys PostgreSQL in a Docker container, attaching it to the created network and setting the superuser password.
+3. **Run the docker_postgres tasks once**: Ensures that the tasks are only run once to avoid redundancy.
+
+## Handlers
+- **Create database**: Creates a new database with the specified name.
+- **Create database user**: Sets up a user with full privileges on the newly created database.
+
+## Usage
+1. Set the required variables in your playbook or inventory file.
+2. Include this role in your playbook.
+3. Run the playbook against the target host.
+
+## Notes
+- The PostgreSQL server is bound to `127.0.0.1:5432` on the host machine, making it accessible only from localhost.
+- Ensure that the provided passwords are secure and stored securely, preferably using Ansible Vault or another encryption method.