Add dkim selector suffix tests #34 #106

Job	Run time
test / check if job needs to run	5s
test / prepare test matrix	8s
test / MOODLE_310_STABLE - pgsql - php 7.2 - tool_emailutils	2m 29s
test / MOODLE_311_STABLE - mariadb - php 7.3 - tool_emailutils	2m 30s
test / MOODLE_39_STABLE - mariadb - php 7.2 - tool_emailutils	2m 32s
test / MOODLE_39_STABLE - pgsql - php 7.2 - tool_emailutils	2m 25s
test / MOODLE_39_STABLE - mariadb - php 7.3 - tool_emailutils	2m 22s
test / MOODLE_39_STABLE - pgsql - php 7.3 - tool_emailutils	2m 25s
test / MOODLE_400_STABLE - pgsql - php 7.3 - tool_emailutils	2m 55s
test / MOODLE_401_STABLE - mariadb - php 7.4 - tool_emailutils	2m 43s
test / MOODLE_401_STABLE - pgsql - php 8.0 - tool_emailutils	3m 21s
test / MOODLE_401_STABLE - mariadb - php 8.0 - tool_emailutils	3m 3s
test / MOODLE_402_STABLE - pgsql - php 8.0 - tool_emailutils	2m 37s
test / MOODLE_401_STABLE - pgsql - php 7.4 - tool_emailutils	2m 44s
test / MOODLE_402_STABLE - mariadb - php 8.0 - tool_emailutils	2m 34s
test / MOODLE_402_STABLE - pgsql - php 8.1 - tool_emailutils	2m 34s
test / MOODLE_402_STABLE - mariadb - php 8.1 - tool_emailutils	2m 43s
test / MOODLE_403_STABLE - pgsql - php 8.0 - tool_emailutils	2m 50s
test / MOODLE_403_STABLE - mariadb - php 8.0 - tool_emailutils	2m 45s
test / MOODLE_403_STABLE - pgsql - php 8.2 - tool_emailutils	2m 44s
test / MOODLE_403_STABLE - mariadb - php 8.2 - tool_emailutils	2m 33s
test / Release to the Moodle plugin directory	0s
	51m 2s

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