CI: do the rebuilds via kaniko.

1 job from ci-changes in 18 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
failed #241216
build

00:00:18

 
Name Stage Failure
failed
build Build
From https://code.videolan.org/videolan/docker-images-aarch64
+ 5d3265e...d9ca3ad ci-changes -> origin/ci-changes (forced update)
Checking out d9ca3ad6 as ci-changes...
Skipping Git submodules setup
$ echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" > /kaniko/.docker/config.json # collapsed multi-line command
/bin/sh: eval: line 1: git: not found
Changed images: ''
/bin/sh: eval: line 1: syntax error: unterminated quoted string
ERROR: Job failed: exit code 2