Merge remote-tracking branch 'nl6720/no-mount'

* nl6720/no-mount:
  mkarchiso: ensure there are no existing image files before trying to create them
  mkarchiso: copy files to ext4 image using mkfs.ext4's -d option instead of mounting the file system
7 jobs for master in 42 minutes and 22 seconds (queued for 11 seconds)
Status Name Job ID Coverage
  Check
passed check #32299

00:00:14

 
  Build
passed build_long: [baseline iso] #32302
fast-single-thread

00:20:57

passed build_long: [baseline netboot] #32303
fast-single-thread

00:19:25

passed build_long: [releng iso] #32304
fast-single-thread

00:39:28

passed build_long: [releng netboot] #32305
fast-single-thread

00:42:06

passed build_short: [baseline bootstrap] #32300

00:15:27

passed build_short: [releng bootstrap] #32301

00:15:06