flatpak: add tests in CI, add no_dependencies parameter (#2751)

* Similar version restrictions than flatpak_remote tests.

* ...

* Try to work around missing dependencies.

* Revert "Try to work around missing dependencies."

This reverts commit 66a4e38566.

* Add changelog.

* App8 -> App2; make sure that there are two apps App1 and App2.

* Fix forgotten variabe.

* Remove test notices.

* Seems like flatpak no longer supports file:// URLs.

The tests would need to be rewritten to offer the URL via http:// instead.

* Try local HTTP server for URL tests.

* ...

* Lint, add status check.

* Add boilerplate.

* Add 'ps aux'.

* Surrender to -f.

* Work around apparent flatpak bug.

* Fix YAML.

* Improve condition.

* Make sure test reruns behave better.

tests/integration/targets/flatpak/tasks/main.yml

@@ -30,8 +30,8 @@
 
   - name: Test executable override
     flatpak:
-      name: org.gnome.Characters
-      remote: flathub
+      name: com.dummy.App1
+      remote: dummy-remote
       state: present
       executable: nothing-that-exists
     ignore_errors: true
@@ -57,5 +57,20 @@
     vars:
       method: system
 
+  always:
+
+  - name: Check HTTP server status
+    async_status:
+      jid: "{{ webserver_status.ansible_job_id }}"
+    ignore_errors: true
+
+  - name: List processes
+    command: ps aux
+
+  - name: Stop HTTP server
+    command: >-
+      pkill -f -- '{{ remote_tmp_dir }}/serve.py'
+
   when: |
-      ansible_distribution in ('Fedora', 'Ubuntu')
+      ansible_distribution == 'Fedora' or
+      ansible_distribution == 'Ubuntu' and not ansible_distribution_major_version | int < 16