use constant for image types #322

Job	Run time
fedora39 (t/*.t)	1m 57s
fedora39 (t/mt7/[^t]*)	14m 51s
fedora39 (t/mt7/t*)	8m 20s
fedora39 (t/admin_theme_id/ t/app/ t/class/ t/cms/ t/model/ t/mt_object/ t/object_driver/ t/task/...	9m 13s
fedora39 (t/cms_permission/)	7m 55s
fedora39 (t/data_api/)	4m 56s
fedora39 (t/tag/)	2m 26s
fedora39 (plugins/*/t)	1m 59s
fedora39 (selenium)	7m 18s
fedora39 (php)	1m 21s
fedora35	0s
fedora37	0s
centos6	0s
fedora40	0s
cloud7 (t/*.t)	1m 36s
extra	0s
bullseye	0s
buster	0s
cloud7 (t/mt7/[^t]*)	14m 53s
cloud7 (t/mt7/t*)	7m 42s
cloud7 (t/admin_theme_id/ t/app/ t/class/ t/cms/ t/model/ t/mt_object/ t/object_driver/ t/task/ t...	9m 42s
cloud7 (t/cms_permission/)	8m 5s
cloud7 (t/data_api/)	5m 25s
cloud7 (t/tag/)	2m 41s
cloud7 (plugins/*/t)	1m 59s
cloud7 (php)	1m 27s
notify_slack	11s
	1h 53m 57s

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