Pre-install browsers in docker container

[andrewvc]

The current docker container can't run playwright scripts since the required playwright browsers are missing, this PR fixes that by pre-installing them

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[hassy]

Thanks @andrewvc!

[hassy]

We'll need to make a couple of changes to the Dockerfile before shipping this:

• Current Docker image is the plain Alpine-based Node.js image. It won't have the OS dependencies needed to run the browsers, so we'll need to install those. playwright install --with-deps will do it for us, but it expects an Ubuntu/Debian-based system, so:
  • We'll need to switch to using an Ubuntu/Debian-based Node.js image. 22-bookworm-slim should work.
• Artillery's Playwright integration is limited to Chromium at the moment, so we don't need to install all default browsers. playwright install chromium will install just Chromium.

[andrewvc]

Thank you!