add dbus to build-time deps

the build was erroing out with `'dbus-run-session' not found or not
executable`

apk search shows that this command comes from dbus package and adding
dbus as build-time dependency fixes the error.

Signed-off-by: kranurag7 <81210977+kranurag7@users.noreply.github.com>

libsecret.yaml

@@ -22,6 +22,7 @@ environment:
       - build-base
       - busybox
       - ca-certificates-bundle
+      - dbus
       - glib-dev
       - glib-gir
       - gobject-introspection-dev