ci: Include flatpak_ci_initiative.yml and remove inline copy

The copy was originally done because the include failed while Calls was
still being hosted at source.puri.sm.

.gitlab-ci.yml

@@ -1,5 +1,6 @@
 include:
  - 'https://source.puri.sm/Librem5/librem5-ci/raw/master/librem5-pipeline-definitions.yml'
+ - 'https://gitlab.gnome.org/GNOME/citemplates/raw/master/flatpak/flatpak_ci_initiative.yml'
 
 stages:
  - build
@@ -76,51 +77,10 @@ package:deb-pureos-byzantium:arm64:
     - aarch64
   extends: .l5-build-debian-package
 
-# For some reason including https://gitlab.gnome.org/GNOME/citemplates/raw/master/flatpak/flatpak_ci_initiative.yml fails with a network error (status code 500), therefore it's copied here
-.flatpak:
-  image: 'registry.gitlab.gnome.org/gnome/gnome-runtime-images/gnome:master'
-  stage: 'package'
-  interruptible: true
-  timeout: 4h
-  # Make CI pass while I figure things out
-  allow_failure: true
-  tags:
-    - flatpak
-  script:
-    - rewrite-flatpak-manifest ${MANIFEST_PATH} ${FLATPAK_MODULE} ${CONFIG_OPTS}
-    - flatpak-builder --user --disable-rofiles-fuse flatpak_app --repo=repo ${BRANCH:+--default-branch=$BRANCH} ${MANIFEST_PATH}
-    # Generate a Flatpak bundle
-    - flatpak build-bundle repo ${BUNDLE} --runtime-repo=${RUNTIME_REPO} ${APP_ID} ${BRANCH}
-    - tar cf repo.tar repo/
-
-  artifacts:
-    name: 'Flatpak artifacts'
-    expose_as: 'Get Flatpak bundle here'
-    when: 'always'
-    paths:
-      - "${BUNDLE}"
-      - 'repo.tar'
-      - '.flatpak-builder/build/${FLATPAK_MODULE}/_flatpak_build/meson-logs/meson-log.txt'
-      - '.flatpak-builder/build/${FLATPAK_MODULE}/_flatpak_build/meson-logs/testlog.txt'
-    reports:
-      junit: '.flatpak-builder/build/${FLATPAK_MODULE}/_flatpak_build/meson-logs/testlog.junit.xml'
-    expire_in: 14 days
-  cache:
-    - key: "$CI_JOB_NAME"
-      paths:
-        - '.flatpak-builder/downloads'
-        - '.flatpak-builder/git'
-    - key: "$CI_JOB_NAME"
-      paths:
-        - '.flatpak-builder/cache'
-        - '.flatpak-builder/ccache'
-  except:
-    variables:
-      - $PKG_ONLY == "1"
-
 flatpak:master:
   extends: .flatpak
   stage: package
+  allow_failure: true
   variables:
     MANIFEST_PATH: "org.gnome.Calls.json"
     RUNTIME_REPO: "https://nightly.gnome.org/gnome-nightly.flatpakrepo"