Change content app's working directory dynamically

As of this commit, content app is no longer storing temporary files in the /var/run/ directory. The temporary files were created during on-demand downloading and were not removed until, e.g., restarting pulp services.

closes #9000

CHANGES/9000.bugfix

@@ -0,0 +1 @@
+Updated the content app's working directory to ``WORKING_DIRECTORY`` specified in ``settings.py``.

pulpcore/content/__init__.py

@@ -55,6 +55,8 @@ def save_heartbeat_blocking():
 
 
 async def server(*args, **kwargs):
+    os.chdir(settings.WORKING_DIRECTORY)
+
     asyncio.ensure_future(_heartbeat())
     for pulp_plugin in pulp_plugin_configs():
         if pulp_plugin.name != "pulpcore.app":

pulpcore/content/handler.py

@@ -720,6 +720,11 @@ def _save_artifact(self, download_result, remote_artifact):
                         **download_result.artifact_attributes, file=download_result.path
                     )
                     artifact.save()
+                else:
+                    #
+                    #
+                    os.unlink(download_result.path)
+
             update_content_artifact = True
             if content_artifact._state.adding:
                 # This is the first time pull-through content was requested.