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/append-field/test/forms.js

@@ -0,0 +1,19 @@
+/* eslint-env mocha */
+
+var assert = require('assert')
+var appendField = require('../')
+var testData = require('testdata-w3c-json-form')
+
+describe('Append Field', function () {
+  for (var test of testData) {
+    it('handles ' + test.name, function () {
+      var store = Object.create(null)
+
+      for (var field of test.fields) {
+        appendField(store, field.key, field.value)
+      }
+
+      assert.deepEqual(store, test.expected)
+    })
+  }
+})