Add Puppeteer executable path environment variable to runloop blueprint

Author: sestinj

.github/workflows/runloop-blueprint-template.json

@@ -20,6 +20,7 @@
   "launch_parameters": {
     "launch_commands": [
       "export DISPLAY=:99",
+      "export PUPPETEER_EXECUTABLE_PATH=/usr/bin/chromium",
       "nohup Xvfb :99 -screen 0 1920x1080x24 > /tmp/xvfb.log 2>&1 &",
       "sleep 2",
       "sudo mkdir -p /home/user",