ci: Ensure the machine-id is set on the Fedora CI image

Run `systemd-machine-id-setup` when creating the image, so that
`/etc/machine-id` is created with a valid ID. Since systemd isn’t
started when running the CI image with podman/Docker, it’s not created
otherwise. This causes some tests to fail.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

.gitlab-ci.yml

@@ -10,7 +10,7 @@ cache:
     - _ccache/
 
 variables:
-  FEDORA_IMAGE: "registry.gitlab.gnome.org/gnome/glib/fedora:v9"
+  FEDORA_IMAGE: "registry.gitlab.gnome.org/gnome/glib/fedora:v10"
   COVERITY_IMAGE: "registry.gitlab.gnome.org/gnome/glib/coverity:v1"
   DEBIAN_IMAGE: "registry.gitlab.gnome.org/gnome/glib/debian-stable:v7"
   ANDROID_IMAGE: "registry.gitlab.gnome.org/gnome/glib/android-ndk:v3"

.gitlab-ci/fedora.Dockerfile

@@ -1,5 +1,8 @@
 FROM fedora:31
 
+# Set /etc/machine-id as it’s needed for some D-Bus tests
+RUN systemd-machine-id-setup
+
 RUN dnf -y update \
  && dnf -y install \
     bindfs \