Add EE support, support GHA in current_container_facts (#336)

* Try adding EE support.

* Use GHA instead of AZP for EE tests.

* Update changelog fragment, extend tests.

* Disable current_container_facts test.

* Increase verbosity.

* 2.9 compatibility.

* Use docker instead of podman for building EE and running tests in it.

* Output some more information (helpful for debugging).

* Fix GHA handling for current_container_facts.

* Try to fix permissions.

meta/ee-requirements.txt

@@ -0,0 +1,2 @@
+docker
+docker-compose

meta/execution-environment.yml

@@ -0,0 +1,5 @@
+---
+version: 1
+dependencies:
+  python: meta/ee-requirements.txt
+  system: meta/ee-bindep.txt