Add minimal flatpak CI.

.gitlab-ci.yml

@@ -1,13 +1,26 @@
-image: rabits/qt:5.11-desktop
+stages:
+  - build
 
-build:
+build-native:
+  image: rabits/qt:5.11-desktop
   stage: build
-  script: 
+  before_script:
     - git submodule update --init --recursive
+  script:
     - mkdir build && cd build
     - qmake ../matrique.pro -spec linux-g++ CONFIG+=qtquickcompiler
     - make -j4
     
   artifacts:
     paths:
-    - build/
+    - build/
+
+build-flatpak:
+  image: fedora:latest
+  stage: build
+  before-script: dnf install flatpak 
+  script:
+    - flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub
+    - flatpak install flathub org.kde.Platform//5.11
+    - gpg2 -v --import <(echo $GPG_SECRET_KEY)
+