CI: do the rebuilds via kaniko.

1 job for ci-changes in 14 seconds
Status Job ID Name Coverage
  Build
failed #241220
build

00:00:14

 
Name Stage Failure
failed
build Build
++ DIRS=' dav1d-debian-unstable'
++ echo 'Changed images: '\'' dav1d-debian-unstable'\'''
Changed images: ' dav1d-debian-unstable'
++ for d in $DIRS
++ '[' -d dav1d-debian-unstable ']'
/bin/bash: command substitution: line 82: unexpected EOF while looking for matching `''
/bin/bash: command substitution: line 83: syntax error: unexpected end of file
++ DATE=
ERROR: Job failed: exit code 1