fix: Update nginx config to use dynamic DNS resolution

- Replace upstream blocks with resolver directive
- Use variables for backend addresses to avoid startup errors
- Simplify configuration with single server block
- Add health check endpoint

server/api/node_modules/jest-pnp-resolver/createRequire.js

@@ -0,0 +1,25 @@
+const nativeModule = require(`module`);
+
+module.exports = (filename) => {
+  // Added in Node v12.2.0
+  if (nativeModule.createRequire) {
+    return nativeModule.createRequire(filename);
+  }
+
+  // Added in Node v10.12.0 and deprecated since Node v12.2.0
+  if (nativeModule.createRequireFromPath) {
+    return nativeModule.createRequireFromPath(filename);
+  }
+
+  // Polyfill
+  return _createRequire(filename);
+};
+
+// Polyfill
+function _createRequire (filename) {
+  const mod = new nativeModule.Module(filename, null)
+  mod.filename = filename
+  mod.paths = nativeModule.Module._nodeModulePaths(path.dirname(filename))
+  mod._compile(`module.exports = require;`, filename)
+  return mod.exports
+}