test: add example with dotenvx to reproduce Unitech#3192 --update-env bug

Author: mkalygin

examples/dotenvx-pm2/.env

@@ -0,0 +1,4 @@
+DE=dotenv
+SH_DE=dotenv
+DE_PM=dotenv
+SH_DE_PM=dotenv

examples/dotenvx-pm2/README.md

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+
+To start http application in cluster mode:
+
+```bash
+$ pm2 start ecosystem.config.js
+# OR
+$ pm2 start http.js -i max
+```

examples/dotenvx-pm2/ecosystem.config.cjs

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+module.exports = {
+  apps: [
+    {
+      name: 'forked_app',
+      script: './index.js',
+      env: {
+        PORT: 8001,
+        PM: 'pm2',
+        SH_PM: 'pm2',
+        DE_PM: 'pm2',
+        SH_DE_PM: 'pm2',
+      },
+    },
+    {
+      name: 'clustered_app',
+      script: './index.js',
+      instances: 2,
+      exec_mode: 'cluster',
+      env: {
+        PORT: 8002,
+        PM: 'pm2',
+        SH_PM: 'pm2',
+        DE_PM: 'pm2',
+        SH_DE_PM: 'pm2',
+      },
+    },
+  ],
+};

examples/dotenvx-pm2/index.js

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+import http from 'http';
+
+const {
+  PORT,
+  SH,
+  DE,
+  PM,
+  SH_DE,
+  SH_PM,
+  DE_PM,
+  SH_DE_PM,
+} = process.env;
+
+http.createServer((req, res) => {
+  res.writeHead(200);
+  res.end(JSON.stringify({
+    SH,
+    DE,
+    PM,
+    SH_DE,
+    SH_PM,
+    DE_PM,
+    SH_DE_PM,
+  }, null, 2));
+}).listen(PORT, '0.0.0.0', () => {
+  console.log(`App listening on port ${PORT}`);
+});

examples/dotenvx-pm2/package.json

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+{
+  "name": "dotenvx-pm2",
+  "version": "1.0.0",
+  "description": "Example usage of dotenvx with pm2",
+  "main": "index.js",
+  "type": "module",
+  "author": "Michael Kalygin",
+  "license": "MIT",
+  "scripts": {
+    "start:json:simple": "SH=shell SH_DE=shell SH_PM=shell SH_DE_PM=shell dotenvx run --env-file .env -- ../../bin/pm2 start ecosystem.config.cjs",
+    "start:json:overload": "SH=shell SH_DE=shell SH_PM=shell SH_DE_PM=shell dotenvx run --env-file .env --overload -- ../../bin/pm2 start ecosystem.config.cjs",
+    "start:pid:simple": "SH=shell SH_DE=shell SH_PM=shell SH_DE_PM=shell dotenvx run --env-file .env -- ../../bin/pm2 start forked_app clustered_app",
+    "start:pid:overload": "SH=shell SH_DE=shell SH_PM=shell SH_DE_PM=shell dotenvx run --env-file .env --overload -- ../../bin/pm2 start forked_app clustered_app",
+    "reload:json:simple": "SH=shell SH_DE=shell SH_PM=shell SH_DE_PM=shell dotenvx run --env-file .env -- ../../bin/pm2 reload ecosystem.config.cjs --update-env",
+    "reload:json:overload": "SH=shell SH_DE=shell SH_PM=shell SH_DE_PM=shell dotenvx run --env-file .env --overload -- ../../bin/pm2 reload ecosystem.config.cjs --update-env",
+    "reload:pid:simple": "SH=shell SH_DE=shell SH_PM=shell SH_DE_PM=shell dotenvx run --env-file .env -- ../../bin/pm2 reload forked_app clustered_app --update-env",
+    "reload:pid:overload": "SH=shell SH_DE=shell SH_PM=shell SH_DE_PM=shell dotenvx run --env-file .env --overload -- ../../bin/pm2 reload forked_app clustered_app --update-env",
+    "delete": "../../bin/pm2 delete ecosystem.config.cjs"
+  },
+  "dependencies": {
+    "@dotenvx/dotenvx": "^1.10.2"
+  }
+}