fedora-intune: minimal GNOME workstation with Intune and Defender

New image for testing Microsoft Intune enrollment and Linux compliance
policies: a minimal GNOME workstation (gnome-initial-setup, Ptyxis,
Files) with the Intune app, the Microsoft identity broker, Edge and
Defender for Endpoint (mdatp) from packages.microsoft.com (RHEL 10
builds, limited to those packages with includepkgs).

No Kanidm: the Intune app installs its own authselect profile with
pam_intune for the password compliance checks. Its %post cannot select
the profile or load the SELinux module during a compose, so both are
redone in postprocess.

build.sh now copies every *.yaml of an image, so manifests can be split
into more files than manifest.yaml and custom.yaml.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

images/fedora-intune/repos/microsoft.repo

@@ -0,0 +1,16 @@
+[microsoft-rhel10]
+name=Microsoft Production (RHEL 10)
+baseurl=https://packages.microsoft.com/rhel/10/prod/
+enabled=1
+gpgcheck=1
+repo_gpgcheck=1
+gpgkey=https://packages.microsoft.com/keys/microsoft-2025.asc
+includepkgs=intune-portal microsoft-identity-broker mdatp
+
+[microsoft-edge]
+name=Microsoft Edge
+baseurl=https://packages.microsoft.com/yumrepos/edge/
+enabled=1
+gpgcheck=1
+gpgkey=https://packages.microsoft.com/keys/microsoft.asc
+includepkgs=microsoft-edge-stable