issue #3: add persistent classes #11

Job	Run time
ci / check if job needs to run	2s
ci / prepare test matrix	15s
ci / MOODLE_401_STABLE - pgsql - php 7.4 - tool_dynamic_cohorts	2m 51s
ci / MOODLE_401_STABLE - mariadb - php 7.4 - tool_dynamic_cohorts	2m 51s
ci / MOODLE_401_STABLE - pgsql - php 8.0 - tool_dynamic_cohorts	3m 4s
ci / MOODLE_401_STABLE - mariadb - php 8.0 - tool_dynamic_cohorts	2m 58s
ci / MOODLE_402_STABLE - pgsql - php 8.0 - tool_dynamic_cohorts	2m 41s
ci / MOODLE_402_STABLE - mariadb - php 8.0 - tool_dynamic_cohorts	2m 41s
ci / MOODLE_402_STABLE - mariadb - php 8.1 - tool_dynamic_cohorts	2m 25s
ci / MOODLE_402_STABLE - pgsql - php 8.1 - tool_dynamic_cohorts	2m 46s
ci / MOODLE_403_STABLE - pgsql - php 8.0 - tool_dynamic_cohorts	3m 31s
ci / MOODLE_403_STABLE - mariadb - php 8.0 - tool_dynamic_cohorts	2m 42s
ci / MOODLE_403_STABLE - pgsql - php 8.2 - tool_dynamic_cohorts	2m 47s
ci / MOODLE_403_STABLE - mariadb - php 8.2 - tool_dynamic_cohorts	2m 45s
ci / Release to the Moodle plugin directory	0s
	34m 19s

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