Improve default dkim selector #34 #99

Job	Run time
test / check if job needs to run	4s
test / prepare test matrix	9s
test / MOODLE_310_STABLE - pgsql - php 7.2 - tool_emailutils	1m 25s
test / MOODLE_311_STABLE - mariadb - php 7.3 - tool_emailutils	1m 21s
test / MOODLE_39_STABLE - mariadb - php 7.2 - tool_emailutils	1m 11s
test / MOODLE_39_STABLE - pgsql - php 7.2 - tool_emailutils	1m 13s
test / MOODLE_39_STABLE - mariadb - php 7.3 - tool_emailutils	1m 12s
test / MOODLE_39_STABLE - pgsql - php 7.3 - tool_emailutils	1m 19s
test / MOODLE_400_STABLE - pgsql - php 7.3 - tool_emailutils	1m 25s
test / MOODLE_401_STABLE - pgsql - php 7.4 - tool_emailutils	1m 21s
test / MOODLE_401_STABLE - mariadb - php 7.4 - tool_emailutils	1m 19s
test / MOODLE_401_STABLE - pgsql - php 8.0 - tool_emailutils	1m 32s
test / MOODLE_401_STABLE - mariadb - php 8.0 - tool_emailutils	1m 35s
test / MOODLE_402_STABLE - pgsql - php 8.0 - tool_emailutils	1m 32s
test / MOODLE_402_STABLE - mariadb - php 8.0 - tool_emailutils	1m 29s
test / MOODLE_402_STABLE - mariadb - php 8.1 - tool_emailutils	1m 32s
test / MOODLE_403_STABLE - pgsql - php 8.0 - tool_emailutils	1m 35s
test / MOODLE_403_STABLE - mariadb - php 8.0 - tool_emailutils	1m 47s
test / MOODLE_403_STABLE - mariadb - php 8.2 - tool_emailutils	1m 52s
test / MOODLE_403_STABLE - pgsql - php 8.2 - tool_emailutils	1m 46s
test / MOODLE_402_STABLE - pgsql - php 8.1 - tool_emailutils	1m 30s
test / Release to the Moodle plugin directory	0s
	28m 9s

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