chore: use env variable to switch browser headless mode

.vscode/launch.json

@@ -39,6 +39,27 @@
       "preLaunchTask": "Backend:build:watch",
       "killBehavior": "forceful"
     },
+    {
+      "name": "Debug Stand Alone Crawl + Browser",
+      "request": "launch",
+      "runtimeArgs": [
+        "--env-file=.secret.local",
+      ],
+      "env": {
+        "GCLOUD_PROJECT": "reader-6b7dc",
+        "DEBUG_BROWSER": "true",
+        "LD_PRELOAD": "/usr/local/lib/libcurl-impersonate-chrome.dylib"
+      },
+      "cwd": "${workspaceFolder}",
+      "program": "build/stand-alone/crawl.js",
+      "skipFiles": [
+        "<node_internals>/**"
+      ],
+      "type": "node",
+      "outputCapture": "std",
+      "preLaunchTask": "Backend:build:watch",
+      "killBehavior": "forceful"
+    },
     {
       "name": "Debug Stand Alone Search",
       "request": "launch",

src/services/puppeteer.ts

@@ -561,7 +561,7 @@ export class PuppeteerControl extends AsyncService {
         }
         this.browser = await puppeteer.launch({
             timeout: 10_000,
-            headless: true,
+            headless: !Boolean(process.env.DEBUG_BROWSER),
             executablePath: process.env.OVERRIDE_CHROME_EXECUTABLE_PATH,
             args: ['--disable-dev-shm-usage']
         }).catch((err: any) => {