Feat: healthcheck uses ping instead of DNS

internal/healthcheck/ping.go

@@ -0,0 +1,19 @@
+package healthcheck
+
+import "github.com/go-ping/ping"
+
+//go:generate mockgen -destination=pinger_mock_test.go -package healthcheck . Pinger
+
+type Pinger interface {
+	Run() error
+	Stop()
+}
+
+func newPinger() (pinger *ping.Pinger) {
+	const addrToPing = "1.1.1.1"
+	const count = 1
+	pinger = ping.New(addrToPing)
+	pinger.Count = count
+	pinger.SetPrivileged(true)
+	return pinger
+}