Feature: support object cache services conditionally

[renatonascalves]

Supports redis and memcached.

The way I'm adding the services conditionally is necessary until Github suports it properly. See https://github.com/actions/runner/issues/822

I tested this in two projects.

Here is one example where I used memcached to skip some unit tests: https://github.com/alleyinteractive/wp-404-caching/actions/runs/8515841284/job/23323992799

Here is another one to test redis and memcached: https://github.com/alleyinteractive/mantle-framework/actions/runs/8515744271/job/23323736947

See how this test works without redis.

fixes #55 fixes #46