JOOMLA_CACHE requires integer value

[stevenrombauts]

The Joomla core we based this code on had already introduced the "progressive" and "conservative" caching options, instead of just enabled or disabled. Setting the JOOMLA_CACHE env var to "true" doesn't actually enable it. The value gets compared to an integer, in which case its value is 0.

See:

joomlatools-platform/lib/libraries/joomla/cache/cache.php

Line 57 in aad4555

'caching' => ($conf->get('caching') >= 1) ? true : false,

Update the .env-example file to avoid confusion.