appdata: Improve appdata for AppStream 1.0

- Add the `<developer><name>` tag
- Mark the `<developer_name>` tag as deprecated
- Improve appstreamcli parameters
- Activate meson tests on Flatpak manifest

com.rafaelmardojai.Blanket.json

@@ -41,6 +41,7 @@
             "name" : "blanket",
             "builddir" : true,
             "buildsystem" : "meson",
+            "run-tests" : true,
             "sources" : [
                 {
                     "type" : "dir",

data/com.rafaelmardojai.Blanket.metainfo.xml.in

@@ -38,7 +38,11 @@
   <url type="translate">https://hosted.weblate.org/engage/blanket/</url>
   <url type="donation">https://rafaelmardojai.com/donate/</url>
   <url type="vcs-browser">https://github.com/rafaelmardojai/blanket</url>
+  <!-- developer_name tag deprecated with Appstream 1.0 -->
   <developer_name translatable="no">Rafael Mardojai CM</developer_name>
+  <developer id="github.com">
+      <name translatable="no">Rafael Mardojai CM</name>
+  </developer>
   <update_contact>email_AT_rafaelmardojai.com</update_contact>
   <content_rating type="oars-1.1" />
 

data/meson.build

@@ -27,7 +27,8 @@ appstream_file = i18n.merge_file(
 appstreamcli = find_program('appstreamcli', required: false)
 if appstreamcli.found()
   test('Validate appstream file', appstreamcli,
-    args: ['validate', '--no-net', appstream_file]
+    args: ['validate', '--no-net', '--explain', appstream_file],
+    workdir: meson.current_build_dir()
   )
 endif