nginx: add tests for config

.github/workflows/test-nginx.yml

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+name: Test nginx config
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    timeout-minutes: 10
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
+      with:
+        node-version: 20
+    - run: cd test && npm i
+    - run: cd test && ./run-tests.sh

test/.gitignore

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+/node_modules/

test/files/nginx-test/acme-challenge

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+hi-from-letsencrypt

test/files/nginx-test/http_root/index.html

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+hi:/index.html

test/files/nginx-test/http_root/should-be-cached.txt

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+hi:/should-be-cached.txt

test/files/nginx-test/http_root/version.txt

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+hi:/version.txt

test/mock-http-server/.gitignore

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+/node_modules/

test/mock-http-server/index.js

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+const express = require('express');
+
+const port = process.env.PORT || 80;
+const log = (...args) => console.log('[mock-http-server]', ...args);
+
+const requests = [];
+
+const app = express();
+
+app.get('/health',      withStdLogging((req, res) => res.send('OK')));
+app.get('/request-log', withStdLogging((req, res) => res.json(requests)));
+app.get('/reset',       withStdLogging((req, res) => {
+  requests.length = 0;
+  res.json('OK');
+}));
+
+app.get('/*', logRequestType('GET'));
+app.post('/*', logRequestType('POST'));
+// TODO add more methods as required
+
+app.listen(port, () => {
+  log(`Listening on port: ${port}`);
+});
+
+function withStdLogging(fn) {
+  return (req, res) => {
+    console.log(new Date(), req.method, req.path);
+    return fn(req, res);
+  };
+}
+
+function logRequestType(method) {
+  return withStdLogging((req, res) => {
+    requests.push({ method, path:req.path });
+    res.send('OK');
+  });
+}