How to run PostgreSQL & PgAdmin in 3 steps using Docker

Note: This article is a PostgreSQL and PgAdmin adapted version of my post Run MySQL & phpMyAdmin locally in 3 steps using Docker

Installing a relational database with a web based management tool is a very common requirement for a wide range of software projects. Not too many years ago, developers needed to download and install these components manually into our local machines in order to be able to work. However, thanks to container based technologies like docker, we can get our environment up and running in 3 simple steps.