fixup! Add browsers for tests: Playwright, Firefox, geckodriver, headless Chrome (closes #10)

Model: deepseek-v4-pro

README.md

@@ -98,9 +98,18 @@ the `Dockerfile`:
 | `NVM_GIT_TAG`      | `nvm-sh/nvm` release tag   |
 | `PYENV_GIT_TAG`    | `pyenv/pyenv` release tag  |
 
-Everything else resolves to its current release at build time: Ubuntu
-packages, Go, Node LTS, Python, Hugo, golangci-lint, npm, yarn, pnpm,
-wrangler, prettier, Playwright and its browsers, Firefox, geckodriver.
+Everything else resolves to its current release at build time:
+
+- Ubuntu packages
+- Go, Node LTS, and Python
+- Hugo and golangci-lint
+- npm, yarn, pnpm, wrangler, and prettier
+- Playwright and its browsers
+- Firefox and geckodriver
+
+Playwright installs its browsers for the image's Playwright version only. A
+child image that pins a different Playwright version downloads its own
+browsers.
 
 ## Services and init