fix escaping whitespaces in filename

Signed-off-by: Sebastian Schüpbach <sebastian.schuepbach@unibas.ch>
3 jobs for master in 4 minutes and 18 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #58689
mbr
test

00:02:08

passed #58690
mbr
test-chart

00:00:14

 
  Publish
passed #58691
mbr
build-latest-image

00:02:09