Missing env in plex scanner call through docker

[thel1988]

Describe the bug
When the autoscan is initaing a scan through Docker it seems that Plex scanner is not able to scan as it is missing an enviromental variable: PLEX_MEDIA_SERVER_APPLICATION_SUPPORT_DIR=/config for plex scanner to function.

To Reproduce
Steps to reproduce the behavior:

1. When I try to reproduce the error, i will just try to run the following command:
   python scan.py sections --loglevel DEBUG and have added the DEBUG loglevel.
   In the log bellow docker -exec it seems that the variable is missing.

Logs
Link to debug or trace log files.

 2020-01-14 14:20:47,778 -     INFO -      PLEX [23235231288648]: Using Plex Scanner


Plex Sections:
==============
 2020-01-14 14:20:47,778 -    DEBUG -      PLEX [23235231288648]: docker exec -u nobody -it binhex-plexpass bash -c 'export LD_LIBRARY_PATH=/usr/lib/plexmediaserver;/usr/lib/plexmediaserver/Plex\ Media\ Scanner --list'
terminate called after throwing an instance of 'soci::soci_error'
  what():  sqlite3_statement_backend::prepare: no such column: library_sections.content_changed_at for SQL: select library_sections.id as 'library_sections_id', library_sections.library_id as 'library_sections_library_id', library_sections.name as 'library_sections_name', library_sections.name_sort as 'library_sections_name_sort', library_sections.section_type as 'library_sections_section_type', library_sections.language as 'library_sections_language', library_sections.agent as 'library_sections_agent', library_sections.scanner as 'library_sections_scanner', library_sections.user_thumb_url as 'library_sections_user_thumb_url', library_sections.user_art_url as 'library_sections_user_art_url', library_sections.user_theme_music_url as 'library_sections_user_theme_music_url', library_sections.created_at as 'library_sections_created_at', library_sections.updated_at as 'library_sections_updated_at', library_sections.scanned_at as 'library_sections_scanned_at', library_sections.user_fields as 'library_sections_user_fields', library_sections.query_xml as 'library_sections_query_xml', library_sections.query_type as 'library_sections_query_type', library_sections.uuid as 'library_sections_uuid', library_sections.changed_at as 'library_sections_changed_at', library_sections.content_changed_at as 'library_sections_content_changed_at' from library_sections
****** PLEX MEDIA SCANNER CRASHED, CRASH REPORT WRITTEN: /home/nobody/Library/Application Support/Plex Media Server/Crash Reports/1.18.4.2171-ac2afe5f8/PLEX MEDIA SCANNER/22f3c2a6-fa1a-dc99-2e29def9-792ee3ae.dmp
bash: line 1:  3465 Aborted                 /usr/lib/plexmediaserver/Plex\ Media\ Scanner --list

System Information

• Plex Autoscan Version: Master (latest)
• Operating System: It is running the docker:
  https://hub.docker.com/r/sabrsorensen/alpine-plex_autoscan

**Config
https://pastebin.com/JKadXN0p