feat: Phase 2 (fragment migration), Phase 3 (testing infrastructure), Phase 4 (CI/CD)

Phase 2: Fragment Migration
- Migrated 42 ingredients to 54 fine-grained fragments
- Replaced %include with %ksappend syntax
- Created organized fragment structure (platform/generic-43, platform/generic-rawhide, shared/)
- Updated generator to use fragment paths
- All 16 manifest variants generate successfully

Phase 3: Testing Infrastructure
- Created containerized test runner (tests/container/)
- Added integration test suite (tests/integration/)
- Created golden master fixtures (tests/fixtures/expected_recipes/)
- 41 tests passing (36 unit + 5 integration)
- 54 fragments, 16 recipes validated

Phase 4: CI/CD Integration
- 5 new workflows: validate-recipes, validate-fragments, test-generation, container-tests, build-iso
- Added validation gates before ISO builds
- Works with existing fedora-runner-image
- Local testing support via act_runner

fragments/shared/desktop/vmm/packages.ks

@@ -0,0 +1,68 @@
+%packages --exclude-weakdeps # Beginning of the packages section. Excludes weak package dependencies.
+
+virt-manager # Install virt-manager, a graphical front-end for QEMU/KVM
+
+%end
+
+%post --nochroot --log=/mnt/sysimage/root/virt-manager-post.log # Beginning of %post section. Those commands are executed outside the chroot environment. Add logging.
+
+# Create a file to autostart virt-manager
+cat > /mnt/sysimage/etc/xdg/autostart/virt-manager.desktop << EOF
+[Desktop Entry]
+Type=Application
+Name=Virtual Machine Manager
+Exec=virt-manager
+EOF
+
+# Modify the default virt-manager behavior for misc. options
+cat >> /mnt/sysimage/usr/share/glib-2.0/schemas/org.virt-manager.virt-manager.gschema.override<< EOF
+
+# Modify the default virt-manager behavior for misc. options
+[org.virt-manager.virt-manager]
+xmleditor-enabled=true
+manager-window-height=600
+manager-window-width=200
+
+# Libvirt URIs listed in the manager window
+[org.virt-manager.virt-manager.connections]
+uris=['qemu:///system', 'qemu:///session']
+autoconnect=['qemu:///session']
+
+# Show usage in the domain list
+[org.virt-manager.virt-manager.vmlist-fields]
+cpu-usage=false
+
+# Settings related to statistics
+[org.virt-manager.virt-manager.stats]
+update-interval=3
+enable-disk-poll=true
+enable-memory-poll=true
+enable-net-poll=true
+
+# Default behavior for the console
+[org.virt-manager.virt-manager.console]
+scaling=2
+resize-guest=1
+autoconnect=false
+
+# Do not show toolbar
+[org.virt-manager.virt-manager.details]
+show-toolbar=false
+
+# Modify default values for new VMs
+[org.virt-manager.virt-manager.new-vm]
+storage-format='raw'
+cpu-default='host-model'
+graphics-type='spice'
+
+# Modify the default virt-manager behavior for confirmation dialogues
+[org.virt-manager.virt-manager.confirm]
+forcepoweroff=false
+removedev=false
+unapplied-dev=false
+
+EOF
+
+glib-compile-schemas /mnt/sysimage/usr/share/glib-2.0/schemas/
+
+%end # End of the %post section