sitespeed.io is not on PATH in the container -- the base image uses a
full absolute path for its ENTRYPOINT. We now run 'find' during the
Docker build, write the path to /sitespeed_env, and source it in
start.sh so SITESPEED_BIN is set before node app.js starts.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Without Xvfb running, Chrome exits immediately with code 1.
The base sitespeedio image normally handles this via its own
entrypoint script; we now replicate that with start.sh.
Also drop --headless (breaks visual metrics) and add --disable-gpu
for stable Chrome rendering inside Docker.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
