Config tweaks for docker

- Remove `$` interpolation for env
- Allow puppeteer to work headless in docker, headful with npx

src/puppeteer/README.md

@@ -72,7 +72,7 @@ Here's the Claude Desktop configuration to use the Puppeter server:
   "mcpServers": {
     "puppeteer": {
       "command": "docker",
-      "args": ["run", "-i", "--rm", "--init", "ai/mcp-puppeteer"]
+      "args": ["run", "-i", "--rm", "--init", "-e", "DOCKER_CONTAINER=true", "ai/mcp-puppeteer"]
     }
   }
 }

src/puppeteer/index.ts

@@ -108,7 +108,9 @@ const screenshots = new Map<string, string>();
 
 async function ensureBrowser() {
   if (!browser) {
-    browser = await puppeteer.launch({ headless: true, args: ["--no-sandbox"] });
+    const npx_args = { headless: false }
+    const docker_args = { headless: true, args: ["--no-sandbox", "--single-process", "--no-zygote"] }
+    browser = await puppeteer.launch(process.env.DOCKER_CONTAINER ? docker_args : npx_args);
     const pages = await browser.pages();
     page = pages[0];