releng/packages: Add archinstall to the list of packages

Add archinstall to the list of packages thare are installed on the ISO.
3 jobs for master in 39 minutes and 11 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Lint
passed shellcheck #18436

00:00:14

 
  Build
passed build:secure: [baseline] #18437
secure

00:18:07

passed build:secure: [releng] #18438
secure

00:38:56