[#1764] neofs-node: Allow to check configuration

Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>

CHANGELOG.md

@@ -7,6 +7,7 @@ Changelog for NeoFS Node
 
 - Changelog updates CI step (#1808)
 - Validate storage node configuration before node startup (#1805)
+- `neofs-node -check` command to check the configuration file (#1805)
 
 ### Changed
 

cmd/neofs-node/main.go

@@ -37,6 +37,7 @@ func fatalOnErrDetails(details string, err error) {
 func main() {
 	configFile := flag.String("config", "", "path to config")
 	versionFlag := flag.Bool("version", false, "neofs node version")
+	dryRunFlag := flag.Bool("check", false, "validate configuration and exit")
 	flag.Parse()
 
 	if *versionFlag {
@@ -50,6 +51,10 @@ func main() {
 	err := validateConfig(appCfg)
 	fatalOnErr(err)
 
+	if *dryRunFlag {
+		return
+	}
+
 	c := initCfg(appCfg)
 
 	initApp(c)