How to run PostgreSQL and pgAdmin using Docker?

As a developer, I get to work on various projects, and therefore accumulate different tools. I now face a problem: I have many versions of the same tool installed on my computer. For instance, I have two versions of PostgreSQL. When I switch projects, I need to deactivate one version and activate the other. I lose precious time doing that, and I am never sure I have uninstalled everything correctly if I decide to delete one of them.

Using a containerized database solves my problem: it is easy to install and to use, and I am certain I have correctly deleted everything when I destroy my container.

The details are here: How to run PostgreSQL and pgAdmin using Docker?