FirstRun: add missing libsecret dep for Alpine

This allows building qtkeychain which is a dep for NeoChat
2 jobs for alpine-firstrun-libsecret in 2 minutes and 24 seconds (queued for 18 minutes and 40 seconds)
Status Job ID Name Coverage
  Test
passed smoke-test #93544

00:01:50

passed unit-test #93543

00:00:34