boulder: Use build.aerynos.dev/volatile repository

The idea is to distinguish between the live "new .stones land here" build
repo, and the actual package repo where packages have had a modicum of
testing and where they are sync'd to atomically.

Signed-off-by: Rune Morling <ermo@serpentos.com>

Author: ermo

boulder/data/profile.d/default-x86_64.yaml

@@ -1,6 +1,6 @@
 default-x86_64:
   repositories:
     volatile:
-      uri: "https://packages.aerynos.com/volatile/x86_64/stone.index"
+      uri: "https://build.aerynos.dev/volatile/x86_64/stone.index"
       description: "Volatile AerynOS repo"
       priority: 0