Add update checker

Former-commit-id: 2445ced83b

main.go

@@ -15,6 +15,7 @@ import (
 	"time"
 
 	"github.com/fosrl/newt/logger"
+	"github.com/fosrl/newt/updates"
 	"github.com/fosrl/newt/websocket"
 	"github.com/fosrl/olm/httpserver"
 	"github.com/fosrl/olm/peermonitor"
@@ -326,6 +327,10 @@ func runOlmMainWithArgs(ctx context.Context, args []string) {
 		logger.Info("Olm version " + olmVersion)
 	}
 
+	if err := updates.CheckForUpdate("fosrl", "olm", olmVersion); err != nil {
+		logger.Debug("Failed to check for updates: %v", err)
+	}
+
 	// Log startup information
 	logger.Debug("Olm service starting...")
 	logger.Debug("Parameters: endpoint='%s', id='%s', secret='%s'", endpoint, id, secret)