add flatpak metadata

flatpak/org.zulianc.jminos.yml

@@ -1,4 +1,4 @@
-id: org.zulianc.jminos
+app-id: org.zulianc.jminos
 runtime: org.freedesktop.Platform
 runtime-version: "24.08"
 sdk: org.freedesktop.Sdk
@@ -15,7 +15,7 @@ modules:
     cleanup: ['*']
     build-commands:
       - ./configure --prefix=/app
-      - make -j $(nproc)
+      - make -j $(FLATPAK_BUILDER_N_JOBS)
       - prefix=/app ./scripts/get.sh __local__ __install_only__ 
     sources:
       - type: git
@@ -34,7 +34,9 @@ modules:
       - install -D output/bin/* /app/bin
       - cp -r output/data /app/share
       - install -D flatpak/FlatpakLaunch.sh /app/bin
-      - install -D -t /app/share/applications flatpak/org.zulianc.jminos.desktop 
+      - install -D -t /app/share/applications flatpak/${FLATPAK_ID}.desktop
+      - install -Dm644 flatpak/${FLATPAK_ID}.metainfo.xml /app/share/metainfo/${FLATPAK_ID}.metainfo.xml
+      - install -D flatpak/${FLATPAK_ID}.png /app/share/icons/hicolor/512x512/apps/${FLATPAK_ID}.png
     sources:
       - type: dir
         path: ..