escape whitespaces in filename

Signed-off-by: Sebastian Schüpbach <sebastian.schuepbach@unibas.ch>
3 jobs for master in 4 minutes and 6 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #58626
mbr
test

00:01:53

passed #58627
mbr
test-chart

00:00:11

 
  Publish
passed #58628
mbr
build-latest-image

00:02:13