Merge remote-tracking branch 'origin/develop' into shigusegubu

* origin/develop: (207 commits)
  Update README.md
  Mastodon API: Fix list streaming
  nginx example config: remove CORS headers, now managed by CORSPlug.
  config: properly configure CORSPlug.
  oauth: fix token decode regression
  tests: add test for internal data stripping
  activitypub: transmogrifier: sanitize internal representation details from outgoing objects
  lib/mix/tasks: s/@doc/@moduledoc/
  lib/mix/tasks/unsubscribe_user.ex: Fix syntax from bad line copy
  lib/mix/tasks: Add remaining documentation for mix tasks
  config/config.md: Add lines inspired/copied from CONFIGURATION.md
  README.md: Add note about config/config.md
  README.md: Put the systemd’s .service note to the relevant section
  README.md: Add note for OpenRC
  config/config.md: scope_options_enabled also addresses subject
  config/config.md: Fill all the blanks
  config/config.md: Complete it [WIP]
  config/config.md: Create
  Document the mix tasks in ex_doc instead
  Document mix tasks
  ...

installation/pleroma.service

@@ -13,5 +13,15 @@ KillMode=process
 Restart=on-failure
 StandardOutput=journal
 
+; Some security directives.
+; Use private /tmp and /var/tmp folders inside a new file system namespace, which are discarded after the process stops.
+PrivateTmp=true
+; Mount /usr, /boot, and /etc as read-only for processes invoked by this service.
+ProtectSystem=full
+; Sets up a new /dev mount for the process and only adds API pseudo devices like /dev/null, /dev/zero or /dev/random but not physical devices. Disabled by default because it may not work on devices like the Raspberry Pi.
+PrivateDevices=false
+; Ensures that the service process and all its children can never gain new privileges through execve().
+NoNewPrivileges=true
+
 [Install]
 WantedBy=multi-user.target