Fixes for SITE_URL validity checks (#10619)

* [docker] Allow HTTPS port to be specified for Caddy proxy

* Fix naming collision for INVENTREE_WEB_PORT

* Push InvenTree version first

* Adjust Caddyfile

- Change backup server

* Fix docstring

* Tweak for site URL check:

- Ignore port if SITE_LAX_PROTOCOL_CHECK is set
- Invert logic for readability

* Additional checks for port mismatch

* Adjust middleware checks

- Allow for less strict checking of CSRF_TRUSTED_ORIGINS

* Slight refactor

contrib/container/Caddyfile

@@ -30,9 +30,9 @@
 }
 
 # The default server address is configured in the .env file
-# If not specified, the default address is used - http://inventree.localhost
+# If not specified, the proxy listens for all http/https traffic
 # If you need to listen on multiple addresses, or use a different port, you can modify this section directly
-{$INVENTREE_SITE_URL:http://inventree.localhost} {
+{$INVENTREE_SITE_URL:"http://, https://"} {
 	import log_common inventree
 
 	encode gzip