ci: improve visual snapshot workflow setup

[ElectricalBoy]

Summary

This PR removes installation step for playwright by making the entire workflow to run in a prebuilt container.

References

• https://docs.github.com/en/actions/how-tos/write-workflows/choose-where-workflows-run/run-jobs-in-a-container
• https://playwright.dev/docs/ci#docker

How did you test this change?

https://github.com/Liquipedia/Lua-Modules/actions/runs/21707583418/job/62602552921

[mbergen]

What exactly does this improve? runtime isn't any faster, and instead of install playwright we now install build essentials.

[ElectricalBoy]

instead of install playwright we now install build essentials.

yeah I mentioned that too

[FO-nTTaX]

I have no opinion on the visual snapshot testing, so I removed myself from reviewers

[Rathoz]

What exactly does this improve? runtime isn't any faster, and instead of install playwright we now install build essentials.

Setting up the dependencies takes 60s instead of 90-120s, so saving 30-60s is something

[mbergen]

Setting up the dependencies takes 60s instead of 90-120s, so saving 30-60s is something

What am i missing? I don't see that speedup in the action run here.
The time is just spread across different steps, notably container fetch/startup and build tool installation.

[ElectricalBoy]

What am i missing? I don't see that speedup in the action run here.
The time is just spread across different steps, notably container fetch/startup and build tool installation.

it used to take (and still does every once in a while) stupid long just to get Playwright set up
see examples below

• https://github.com/Liquipedia/Lua-Modules/actions/runs/20087901364/job/57629320857
• https://github.com/Liquipedia/Lua-Modules/actions/runs/20088152529/job/57630041627