Flatpak CI - GNOME (https://gitlab.gnome.org/GNOME/Initiatives/-/wikis/DevOps-with-Flatpak)

gitlab-ci.yml

include: 'https://gitlab.gnome.org/GNOME/citemplates/raw/master/flatpak/flatpak_ci_initiative.yml'

flatpak:
    image: 'registry.gitlab.gnome.org/gnome/gnome-runtime-images/gnome:master'
    variables:
        MANIFEST_PATH: "build-aux/flatpak/org.gnome.NautilusDevel.yml"
        FLATPAK_MODULE: "nautilus"
        APP_ID: "org.gnome.NautilusDevel"
        RUNTIME_REPO: "https://nightly.gnome.org/gnome-nightly.flatpakrepo"
        BUNDLE: "nautilus-dev.flatpak"
    extends: '.flatpak'

nightly:
    extends: '.publish_nightly'
    # assuming your job in named 'flatpak'
    dependencies: ['flatpak']
    needs: ['flatpak']