fedora-intune: use Himmelblau instead of the Microsoft Intune app

Go with Entra ID sign-in through Himmelblau for fedora-intune and drop
the Microsoft Intune app (intune-portal, identity broker) variant. With
a single image, the workstation, Edge and Defender manifests move back
from images/shared into images/fedora-intune, and CI builds just that
image again. The Microsoft repo is now limited to mdatp and Edge.

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

.gitea/workflows/build.yaml

@@ -175,22 +175,17 @@ jobs:
     steps: *build_steps
 
   build-intune:
-    name: ${{ matrix.image }} (44)
+    name: fedora-intune (44)
     needs: changes
     if: needs.changes.outputs.intune == 'true'
     runs-on: job-v2
 
-    strategy:
-      fail-fast: false
-      matrix:
-        image: [fedora-intune, fedora-intune-himmelblau]
-
     container:
       image: "quay.io/fedora-ostree-desktops/buildroot:44"
       options: "--security-opt=label=disable --privileged --user 0:0 --device=/dev/fuse --volume /:/run/host:rw"
 
     env:
-      IMAGE: ${{ matrix.image }}
+      IMAGE: fedora-intune
       DISTRO: "44"
       ARCH: x86_64
       REGISTRY: git.plabble.org/misthios
@@ -220,7 +215,7 @@ jobs:
         env:
           RELEASE_TOKEN: ${{ secrets.RELEASE_TOKEN }}
         run: |
-          for image in fedora-cosmic fedora-remote fedora-intune fedora-intune-himmelblau; do
+          for image in fedora-cosmic fedora-remote fedora-intune; do
             ./prune-releases.sh "${image}"
           done
       - name: Prune old registry tags
@@ -232,6 +227,6 @@ jobs:
           authfile=/tmp/prune-auth.json
           echo "${REGISTRY_TOKEN}" | skopeo login -u "${REGISTRY_USERNAME}" \
             --password-stdin --authfile "${authfile}" git.plabble.org
-          for image in fedora-cosmic fedora-remote fedora-intune fedora-intune-himmelblau; do
+          for image in fedora-cosmic fedora-remote fedora-intune; do
             AUTHFILE="${authfile}" ./prune-registry.sh "${image}" Misthios 44 rawhide
           done