CI: add ci file

.gitlab-ci.yml

+include: 'https://gitlab.gnome.org/GNOME/citemplates/raw/master/flatpak/flatpak_ci_initiative.yml'
+
+variables:
+  GIT_SUBMODULE_STRATEGY: normal
+  BUNDLE: "com.frac_tion.teleport.flatpak"
+
+
+.build_template: &distro_build
+  script:
+    - meson _build
+    - ninja -C _build install
+
+stages:
+   - flatpak
+   - build
+   - review
+   - deploy
+
+
+##################
+# Fedora Rawhide #
+##################
+
+fedora:rawhide:
+    image: fedora:rawhide
+    stage: build
+
+    before_script:
+      - dnf install -y gcc meson ninja-build gettext gtk-doc glib2-devel gtk3-devel
+        gnome-online-accounts-devel libpeas-devel evolution-data-server-devel
+        rest-devel json-glib-devel
+
+    <<: *distro_build
+    only:
+    - schedules
+    - web
+    - tags
+
+
+
+################
+# Ubuntu Devel #
+################
+
+ubuntu:devel:
+    image: ubuntu:devel
+    stage: build
+    before_script:
+    # Ubuntu requires running update to fetch metadata and find packges
+    - apt update
+    - apt install -y gcc meson gettext gtk-doc-tools libglib2.0-dev git libgtk-3-dev
+                     libgoa-1.0-dev libpeas-dev libecal1.2-dev libedataserver1.2-dev
+                     librest-dev libjson-glib-dev
+    <<: *distro_build
+    only:
+    - schedules
+    - web
+    - tags
+
+
+
+##################
+# Flatpak Bundle #
+##################
+
+flatpak:master:
+    extends: .flatpak
+    image: registry.gitlab.gnome.org/gnome/gnome-runtime-images/gnome:master
+    stage: flatpak
+    variables:
+        MANIFEST_PATH: "com.frac_tion.teleport.json"
+        RUNTIME_REPO: "https://nightly.gnome.org/gnome-nightly.flatpakrepo"
+        # Replace with your application name, as written in the manifest
+        FLATPAK_MODULE: "teleport"
+        # Make sure to keep this in sync with the Flatpak manifest, all arguments
+        # are passed except the config-args because we build it ourselves
+        MESON_ARGS: "-Dtracing=true -Dprofile=development"
+        APP_ID: "com.frac_tion.teleport"
+
+review:
+    extends: .review
+    stage: review
+    dependencies:
+        - flatpak:master
+
+stop_review:
+    extends: .stop_review
+    stage: review
+
+flatpak:nightly:
+    extends: .publish_nightly
+    dependencies:
+        - flatpak:master