Pull request 2111: 6545-schema-version

Updates #6545.

Squashed commit of the following:

commit b1969128a99ff21c97feb4e7805b4b8133d7122f
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Dec 15 20:04:37 2023 +0300

    home: fix import

commit 872ccea1491a8da76cc24db79247438d0ce4d256
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Dec 15 20:01:15 2023 +0300

    all: output schema version

internal/configmigrate/v11.go

@@ -0,0 +1,33 @@
+package configmigrate
+
+// migrateTo11 performs the following changes:
+//
+//	# BEFORE:
+//	'schema_version': 10
+//	'rlimit_nofile': 42
+//	# …
+//
+//	# AFTER:
+//	'schema_version': 11
+//	'os':
+//	  'group': ''
+//	  'rlimit_nofile': 42
+//	  'user': ''
+//	# …
+func migrateTo11(diskConf yobj) (err error) {
+	diskConf["schema_version"] = 11
+
+	rlimit, _, err := fieldVal[int](diskConf, "rlimit_nofile")
+	if err != nil {
+		return err
+	}
+
+	delete(diskConf, "rlimit_nofile")
+	diskConf["os"] = yobj{
+		"group":         "",
+		"rlimit_nofile": rlimit,
+		"user":          "",
+	}
+
+	return nil
+}