Allow custom path for ActiveStorage local/disk backend

config/storage.yml

@@ -1,6 +1,6 @@
 local:
   service: Disk
-  root: <%= Rails.root.join("storage") %>
+  root: <%= ENV["ACTIVE_STORAGE_PATH"] || Rails.root.join("storage") %>
 
 test:
   service: Disk

docker-compose.yml

@@ -42,6 +42,7 @@ services:
       LDAP_ADMIN_PASSWORD: passthebutter
       LDAP_USE_TLS: "false"
       REDIS_URL: redis://redis:6379/0
+      ACTIVE_STORAGE_PATH: "/akkounts/tmp/attachments"
       RS_REDIS_URL: redis://redis:6379/1
       RS_STORAGE_URL: "http://localhost:4567"
       S3_ENABLED: false