Caddy fix (#6690)

* Caddyfile updates

- Provide CORS headers for /static/ and /media/

* Adjust config_template

- Make more open by default

docker/Caddyfile

@@ -4,33 +4,50 @@
 # - INVENTREE_SERVER: The internal URL of the Inventree container (default: http://inventree-server:8000)
 
 (log_common) {
-    log {
-        output file /var/log/caddy/{args.0}.access.log
-    }
+	log {
+		output file /var/log/caddy/{args[0]}.access.log
+	}
+}
+
+(cors-headers) {
+	header Access-Control-Allow-Origin *
+	header Access-Control-Allow-Methods GET,HEAD,OPTIONS
+	header Access-Control-Allow-Headers User-Agent,Content-Type
+
+	@cors_preflight{args[0]} method OPTIONS
+
+	handle @cors_preflight{args[0]} {
+		respond "" 204
+	}
 }
 
 # Change the host to your domain (this will serve at inventree.localhost)
 {$INVENTREE_SITE_URL:inventree.localhost} {
-    import log_common inventree
+	import log_common inventree
 
-    encode gzip
+	encode gzip
 
-    request_body {
-        max_size 100MB
-    }
+	request_body {
+		max_size 100MB
+	}
 
-    handle_path /static/* {
-        root * /var/www/static
-        file_server
-    }
+	handle_path /static/* {
+		import cors-headers static
 
-    handle_path /media/* {
-        forward_auth {$INVENTREE_SERVER:"http://inventree-server:8000"} {
-            uri /auth/
-        }
-        root * /var/www/media
-        file_server
-    }
+		root * /var/www/static
+		file_server
+	}
 
-    reverse_proxy {$INVENTREE_SERVER:"http://inventree-server:8000"}
+	handle_path /media/* {
+		import cors-headers media
+
+		root * /var/www/media
+		file_server
+
+		forward_auth {$INVENTREE_SERVER:"http://inventree-server:8000"} {
+			uri /auth/
+		}
+	}
+
+	reverse_proxy {$INVENTREE_SERVER:"http://inventree-server:8000"}
 }