fix healthcheck.js with prefix UPTIME_KUMA_

extra/healthcheck.js

@@ -1,19 +1,35 @@
 /*
  * This script should be run after a period of time (180s), because the server may need some time to prepare.
  */
+const { FBSD } = require("../server/util-server");
+
 process.env.NODE_TLS_REJECT_UNAUTHORIZED = "0";
 
 let client;
 
-if (process.env.SSL_KEY && process.env.SSL_CERT) {
+const sslKey = process.env.UPTIME_KUMA_SSL_KEY || process.env.SSL_KEY || undefined;
+const sslCert = process.env.UPTIME_KUMA_SSL_CERT || process.env.SSL_CERT || undefined;
+
+if (sslKey && sslCert) {
     client = require("https");
 } else {
     client = require("http");
 }
 
+// If host is omitted, the server will accept connections on the unspecified IPv6 address (::) when IPv6 is available and the unspecified IPv4 address (0.0.0.0) otherwise.
+// Dual-stack support for (::)
+let hostname = process.env.UPTIME_KUMA_HOST;
+
+// Also read HOST if not FreeBSD, as HOST is a system environment variable in FreeBSD
+if (!hostname && !FBSD) {
+    hostname = process.env.HOST;
+}
+
+const port = parseInt(process.env.UPTIME_KUMA_PORT || process.env.PORT || 3001);
+
 let options = {
-    host: process.env.HOST || "127.0.0.1",
+    host: hostname || "127.0.0.1",
-    port: parseInt(process.env.PORT) || 3001,
+    port: port,
     timeout: 28 * 1000,
 };