Merge branch 'add-ci-table-to-readme' into 'main'

# Tango Database server README

The database device server is the central place for mapping device server names to network locations and

storing configuration data like properties.

This file contains information on installing/upgrading the Tango database

server. This guide assumes that a MySQL daemon runs on the machine you

want to install the database and that the DB server has history capabilities.

It uses a MariaDB/MySQL server as backend.

## Keeping Up-to-date

All tests always pass.

Testing is currently not support on Windows.

## CI support matrix

OS \ Architecture | x86_64 | i686 |

------------------| :----: | :--: |

Linux             | C + T  |   -  |

Windows           | C      |   -  |

`C` means compile testing, `T` running the tests.

# Database upgrade todos for developers