[MM-40712] config: Bugfix on path resolution; fail if given config does not exist (#19360)

* config: bugfix on path resolution; fail if given config does not exist

* reflect review comments

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

cmd/mattermost/commands/db.go

@@ -68,7 +68,7 @@ func initDbCmdF(command *cobra.Command, _ []string) error {
 		return errors.Wrap(err, "error loading custom configuration defaults")
 	}
 
-	configStore, err := config.NewStoreFromDSN(getConfigDSN(command, config.GetEnvironment()), false, customDefaults)
+	configStore, err := config.NewStoreFromDSN(getConfigDSN(command, config.GetEnvironment()), false, customDefaults, true)
 	if err != nil {
 		return errors.Wrap(err, "failed to load configuration")
 	}

cmd/mattermost/commands/server.go

@@ -49,7 +49,7 @@ func serverCmdF(command *cobra.Command, args []string) error {
 		mlog.Warn("Error loading custom configuration defaults: " + err.Error())
 	}
 
-	configStore, err := config.NewStoreFromDSN(getConfigDSN(command, config.GetEnvironment()), false, customDefaults)
+	configStore, err := config.NewStoreFromDSN(getConfigDSN(command, config.GetEnvironment()), false, customDefaults, true)
 	if err != nil {
 		return errors.Wrap(err, "failed to load configuration")
 	}