don't provide default mimetype for thumbnails

3 jobs for master in 8 minutes and 43 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #70344
mbr
test-sbt

00:04:06

 
  Build
passed #70345
mbr
assembly-sbt

00:02:54

 
  Publish
passed #70346
mbr
build-latest-image

00:01:42