Add Docker Healthcheck (#636)

* Add Docker Healthcheck

Fixes #635

* Update Dockerfile_light

* Update healthcheck.js

fix healthcheck output error: "file:///usr/src/app/src/healthcheck.js:1\nvar http = require(\"http\");\n           ^\n\nReferenceError: require is not defined in ES module scope, you can use import instead\nThis file is being treated as an ES module because it has a '.js' file extension and '/usr/src/app/package.json' contains \"type\": \"module\". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.\n    at file:///usr/src/app/src/healthcheck.js:1:12\n    at ModuleJob.run (node:internal/modules/esm/module_job:193:25)\n    at async Promise.all (index 0)\n    at async ESMLoader.import (node:internal/modules/esm/loader:526:24)\n    at async loadESM (node:internal/process/esm_loader:91:5)\n    at async handleMainPromise (node:internal/modules/run_main:65:12)\n"

* update version

Co-authored-by: acalcutt <acalcutt@techidiots.net>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "tileserver-gl",
-  "version": "4.1.2",
+  "version": "4.1.3",
   "description": "Map tile server for JSON GL styles - vector and server side generated raster tiles",
   "main": "src/main.js",
   "bin": "src/main.js",