Media: prevent uploading image types the server doesn’t support. #1031

Job	Run time
twentytwentyfive empty file check	3s
Test twentytwentyone build script	54s
twentytwentyfour empty file check	4s
Test twentytwenty build script	27s
twentytwentythree empty file check	4s
Test twentynineteen build script	10s
twentytwentytwo empty file check	5s
twentytwentyone empty file check	6s
twentytwenty empty file check	5s
twentynineteen empty file check	7s
twentyseventeen empty file check	6s
twentysixteen empty file check	5s
twentyfifteen empty file check	6s
twentyfourteen empty file check	3s
twentythirteen empty file check	7s
twentytwelve empty file check	5s
twentyeleven empty file check	6s
twentyten empty file check	4s
Create twentytwentyfive ZIP file	5s
Create twentytwentyfour ZIP file	6s
Create twentytwentythree ZIP file	6s
Create twentytwentytwo ZIP file	7s
Create twentytwentyone ZIP file	5s
Create twentytwenty ZIP file	4s
Create twentynineteen ZIP file	6s
Create twentyseventeen ZIP file	4s
Create twentysixteen ZIP file	11s
Create twentyfifteen ZIP file	6s
Create twentyfourteen ZIP file	6s
Create twentythirteen ZIP file	5s
Create twentytwelve ZIP file	8s
Create twentyeleven ZIP file	8s
Create twentyten ZIP file	4s
Slack Notifications / Prepare notifications	3s
Slack Notifications / Failure notifications	0s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Cancelled notifications	0s
Slack Notifications / Success notifications	4s
Failed workflow tasks	0s
	4m 25s

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