buster: Add meta-phosh

This allows us to share more things with Debian and to keep
byzantum and amber more in sync

jobs.yml

@@ -331,6 +331,10 @@ mesa:
   dists: ['buster+ci']
   archs: ['aarch64']
   branch: 'pureos/amber-phone'
+meta-phosh:
+  url: https://source.puri.sm/Librem5/debs/meta-phosh.git
+  dists: ['buster']
+  branch: 'pureos/amber-phone'
 meson:
   url: https://source.puri.sm/Librem5/meson.git
   archs: ['aarch64']