Add x-checkers for flatpak builds manifests

Signed-off-by: mr. m  <91018726+mauro-balades@users.noreply.github.com>

build/flatpak/app.zen_browser.zen.yml.template

@@ -49,6 +49,12 @@ modules:
         strip-components: 0
         only-arches:
           - x86_64
+        x-checker-data:
+          type: json
+          url: https://api.github.com/repos/zen-browser/desktop/releases/latest
+          version-query: .tag_name
+          url-query: .assets[] | select(.name=="zen.linux-x86_64.tar.xz") | .browser_download_url
+          is-main-source: true
 
       - type: archive
         url: https://github.com/zen-browser/desktop/releases/download/{version}/zen.linux-aarch64.tar.xz
@@ -56,6 +62,12 @@ modules:
         strip-components: 0
         only-arches:
           - aarch64
+        x-checker-data:
+          type: json
+          url: https://api.github.com/repos/zen-browser/desktop/releases/latest
+          version-query: .tag_name
+          url-query: .assets[] | select(.name=="zen.linux-aarch64.tar.xz") | .browser_download_url
+          is-main-source: true
 
       - type: archive
         url: https://github.com/zen-browser/flatpak/releases/download/{version}/archive.tar