CI: Add automated releases

.gitlab-ci.yml

@@ -1,6 +1,13 @@
 include:
   - project: "GNOME/citemplates"
     file: "flatpak/flatpak_ci_initiative.yml"
+  - component: gitlab.gnome.org/GNOME/citemplates/release-service@master
+    inputs:
+      dist-job-name: "flatpak"
+      tarball-artifact-path: "${TARBALL_ARTIFACT_PATH}"
+
+variables:
+  FLATPAK_MODULE: 'gnome-font-viewer'
 
 variables:
   BUNDLE: "org.gnome.Loupe.Devel.flatpak"
@@ -8,6 +15,7 @@ variables:
   FLATPAK_MODULE: "loupe"
   APP_ID: "org.gnome.Loupe.Devel"
   RUNTIME_REPO: "https://nightly.gnome.org/gnome-nightly.flatpakrepo"
+  TARBALL_ARTIFACT_PATH: ".flatpak-builder/build/${FLATPAK_MODULE}/_flatpak_build/meson-dist/${CI_PROJECT_NAME}-${CI_COMMIT_TAG}.tar.xz"
 
 flatpak:
   extends: ".flatpak@x86_64"