Last reset is not shown for environments which are set in config.php

[abias]

Prerequisites:

• We want to use this plugin in a way that all environments are set in config.php so that there isn't any need for manual plugin configuration in the GUI.
• This bug happens using version 2022011401 from Moodle.org on a Moodle 4.0.x instance.

Steps to reproduce:

• In config.php of the prod instance, add a configuration like this:

// URL of the prod instance (set it here instead of relying on the magic of the plugin).
$CFG->local_envbar_prodwwwroot = https://prod.mymoodle.org';/

// Secret key to allow communication between non-prod environments and the prod environment.
$CFG->local_envbar_secretkey = 'foobar42';

// Array of existing non-prod environments.
$CFG->local_envbar_items = array(
    array(
        'showtext' => 'TEST', 'matchpattern' => https://test.mymoodle.org',/
        'colourbg' => 'crimson', 'colourtext' => 'white'
    )
);

• Add the same identical configuration to the test instance.

Expected result:

• On the test instance, the "last reset" information in the envbar should show the correct last reset date when the instance was last reset from prod.

Actual result:

• On the test instance, the "last reset" information in the envbar always says "Never been refreshed"
  => even if we reset the test instance with the database from prod
  => and even if I force-set the last refresh time on /local/envbar/last_refresh.php within the test instance.

Analysis:

• Doing some debugging, I saw that the local_envbar database table is completely empty in both prod and test
• I also spotted that the code to display the last refresh information in the envbar seems to rely on the fact that the environment is registered in the local_envbar database table.
• I could confirm that, if I remove the $CFG->local_envbar_items setting from config.php on the test instance and register the test environment manually in the GUI, the last refresh time is shown instantly in the envbar.