Include installed `playwright-core` package in Dockerfile about playwright

[mxschmitt]

As of today this is intentional, since different package managers install playwright in different locations. It's often not only about playwright-core, its also about @playwright/test. Most of the end-to-end testing projects we've seen depend on third-party libraries as well - so it wouldn't be beneficial for them. So "npm ci" is usually the way to go.

[VaasRamsay]

My project uses TestContainers to orchestrate all dependencies for tests. So every test will spin up the needed containers, which includes the Playwright container as well. It's a big overhead to run npm ci during container startup, as it's done for every single startup.

[mxschmitt]

I'm not familiar with Testcontainers. Usually installing Playwright takes 2-4 seconds via NPM, since the browsers/OS dependencies are already satisfied in the Docker container. Would you like to reduce this to 0?

Looks like they have no official support for Playwright yet? testcontainers/testcontainers-dotnet#1033 so maybe they will address it there,

There is a PR which was closed: testcontainers/testcontainers-node#726.