Use zstd for initramfs compression

5 jobs for compress-initramfs-zstd in 25 minutes and 44 seconds (queued for 4 seconds)
Status Name Job ID Coverage
  Lint
passed shellcheck #11092

00:00:22

passed shfmt #11093

00:00:10

 
  Build
passed build #11094
fast-single-thread

00:21:21

 
  Test
passed test-cloudimg-qemu #11096

00:04:00

passed test-vagrant-boxes-format #11095

00:00:33