Re-create service ping, docker status changes

See #388

src/pages/api/ping.js

@@ -0,0 +1,28 @@
+import { performance } from "perf_hooks";
+
+import createLogger from "utils/logger";
+import { httpProxy } from "utils/proxy/http";
+
+const logger = createLogger("ping");
+
+export default async function handler(req, res) {
+    const { ping: pingURL } = req.query;
+
+    if (!pingURL) {
+        logger.debug("No ping URL specified");
+        return res.status(400).send({
+        error: "No ping URL given",
+        });
+    }
+    
+    const startTime = performance.now();
+    const [status] = await httpProxy(pingURL, {
+      method: "HEAD"
+    });
+    const endTime = performance.now();
+
+    return res.status(200).json({
+      status,
+      latency: endTime - startTime
+    });
+}