[2.6] docker_container: fix working_dir (#44522)

* docker_container: fix working_dir (#42857)

WorkingDir should be read from Config instead of HostConfig, check
https://docs.docker.com/engine/api/v1.37/#operation/ContainerInspect

* Adding changelog entry.

changelogs/fragments/42857-docker_container-working_dir.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+- "docker_container: fixing ``working_dir`` idempotency problem (https://github.com/ansible/ansible/pull/42857)"

lib/ansible/modules/cloud/docker/docker_container.py

@@ -1292,7 +1292,7 @@ class Container(DockerBaseClass):
             expected_volumes=config.get('Volumes'),
             expected_binds=host_config.get('Binds'),
             volumes_from=host_config.get('VolumesFrom'),
-            working_dir=host_config.get('WorkingDir')
+            working_dir=config.get('WorkingDir')
         )
         if self.parameters.restart_policy:
             config_mapping['restart_retries'] = restart_policy.get('MaximumRetryCount')