Include appstream information for backends

CCBUG: 388716

libdiscover/backends/FlatpakBackend/CMakeLists.txt

@@ -23,3 +23,4 @@ set_target_properties(FlatpakNotifier PROPERTIES INSTALL_RPATH ${CMAKE_INSTALL_F
 
 install(TARGETS FlatpakNotifier DESTINATION ${PLUGIN_INSTALL_DIR}/discover-notifier)
 install(PROGRAMS org.kde.discover-flatpak.desktop DESTINATION ${XDG_APPS_INSTALL_DIR} )
+install( FILES org.kde.discover.flatpak.appdata.xml DESTINATION ${KDE_INSTALL_METAINFODIR} )

libdiscover/backends/FlatpakBackend/org.kde.discover.flatpak.appdata.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<component type='addon'>
+    <id>org.kde.discover.flatpak</id>
+    <name>Flatpak backend</name>
+    <summary>Integrates Flatpak applications into Discover</summary>
+    <extends>org.kde.discover.desktop</extends>
+    <metadata_license>CC0-1.0</metadata_license>
+    <project_license>GPL-2.0+</project_license>
+    <developer_name>Aleix Pol Gonzalez</developer_name>
+    <icon type="stock">system-software-install</icon>
+</component>

libdiscover/backends/PackageKitBackend/CMakeLists.txt

@@ -33,3 +33,5 @@ if(packagekitqt5_VERSION VERSION_GREATER 0.9.7)
     target_compile_definitions(packagekit-backend PUBLIC -DPKQT_0_10)
     target_compile_definitions(DiscoverPackageKitNotifier PUBLIC -DPKQT_0_10)
 endif()
+
+install( FILES org.kde.discover.packagekit.appdata.xml DESTINATION ${KDE_INSTALL_METAINFODIR} )

libdiscover/backends/PackageKitBackend/org.kde.discover.packagekit.appdata.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<component type='addon'>
+    <id>org.kde.discover.packagekit</id>
+    <name>PackageKit backend</name>
+    <summary>Integrates distribution applications into Discover</summary>
+    <extends>org.kde.discover.desktop</extends>
+    <metadata_license>CC0-1.0</metadata_license>
+    <project_license>GPL-2.0+</project_license>
+    <developer_name>Aleix Pol Gonzalez</developer_name>
+    <icon type="stock">system-software-install</icon>
+</component>

libdiscover/backends/SnapBackend/CMakeLists.txt

@@ -5,3 +5,4 @@ target_link_libraries(snap-backend Qt5::Core KF5::CoreAddons KF5::ConfigCore Dis
 
 install(TARGETS snap-backend DESTINATION ${PLUGIN_INSTALL_DIR}/discover)
 install(FILES snap-backend-categories.xml DESTINATION ${DATA_INSTALL_DIR}/libdiscover/categories)
+install( FILES org.kde.discover.snap.appdata.xml DESTINATION ${KDE_INSTALL_METAINFODIR} )

libdiscover/backends/SnapBackend/org.kde.discover.snap.appdata.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<component type='addon'>
+    <id>org.kde.discover.snap</id>
+    <name>Snap backend</name>
+    <summary>Integrates Snap applications into Discover</summary>
+    <extends>org.kde.discover.desktop</extends>
+    <metadata_license>CC0-1.0</metadata_license>
+    <project_license>GPL-2.0+</project_license>
+    <developer_name>Aleix Pol Gonzalez</developer_name>
+    <icon type="stock">system-software-install</icon>
+</component>