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

Firefox comes from Mozilla's own apt repo since Ubuntu's is a snap that
does not run in a container. geckodriver is matched to it at build time.
Playwright installs its Chromium and Firefox, skipping WebKit which has
no linux-arm64 build; Playwright's Chromium is exposed as the headless
Chrome.

Model: deepseek-v4-pro

Dockerfile

@@ -20,6 +20,7 @@ ENV LANG=C.UTF-8 \
     COREPACK_ENABLE_DOWNLOAD_PROMPT=0 \
     COREPACK_ENABLE_AUTO_PIN=0 \
     PYENV_ROOT=/usr/local/pyenv \
+    PLAYWRIGHT_BROWSERS_PATH=/ms-playwright \
     GOPATH=/root/go \
     PATH=/usr/local/go/bin:/root/go/bin:/usr/local/nvm/current/bin:/usr/local/pyenv/shims:/usr/local/pyenv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 

README.md

@@ -30,6 +30,11 @@ Image: `git.eeqj.de/sneak/baseimage`, built for `linux/amd64` and
 | yarn, pnpm      | corepack, cache pre-populated  | `/usr/local/corepack`          |
 | wrangler        | `npm install -g wrangler`      | nvm LTS global bin             |
 | prettier        | `npm install -g prettier`      | nvm LTS global bin             |
+| Playwright      | `npm install -g playwright`    | nvm LTS global bin             |
+| Playwright browsers | `playwright install` (chromium, firefox) | `/ms-playwright`     |
+| Firefox         | Mozilla apt repo               | `/usr/bin/firefox`             |
+| geckodriver     | GitHub release                 | `/usr/local/bin/geckodriver`   |
+| headless Chrome | Playwright Chromium            | `chromium` on `PATH`           |
 | Python (distro) | apt `python3`, `pip`, `venv`   | `/usr/bin/python3`             |
 | pyenv           | git tag                        | `/usr/local/pyenv`             |
 | Python (latest) | `pyenv install`                | `/usr/local/pyenv/versions/*`  |
@@ -68,7 +73,8 @@ dependencies in child images.
 
 Environment variables set in the image: `NVM_DIR`, `NVM_SYMLINK_CURRENT`,
 `COREPACK_HOME`, `COREPACK_ENABLE_DOWNLOAD_PROMPT=0`,
-`COREPACK_ENABLE_AUTO_PIN=0`, `PYENV_ROOT`, `GOPATH`, `LANG=C.UTF-8`.
+`COREPACK_ENABLE_AUTO_PIN=0`, `PYENV_ROOT`, `GOPATH`, `LANG=C.UTF-8`,
+`PLAYWRIGHT_BROWSERS_PATH`.
 
 ### Yarn and corepack
 
@@ -93,7 +99,7 @@ the `Dockerfile`:
 
 Everything else resolves to its current release at build time: Ubuntu
 packages, Go, Node LTS, Python, Hugo, golangci-lint, npm, yarn, pnpm,
-wrangler.
+wrangler, prettier, Playwright and its browsers, Firefox, geckodriver.
 
 ## Services and init
 

bin/test

@@ -35,6 +35,10 @@ vips -l | grep -i heif > /dev/null
     valkey-server --version
     valkey-cli --version
     psql --version
+    playwright --version
+    firefox --version
+    geckodriver --version
+    chromium --version
 '
 
 echo "== $img: runit service lifecycle"

build.sh

@@ -68,7 +68,7 @@ nvm install --lts
 nvm alias default "lts/*"
 nvm use default
 set -ux
-npm install -g npm@latest corepack wrangler prettier
+npm install -g npm@latest corepack wrangler prettier playwright
 corepack enable
 # Pre-populate the corepack cache so projects that pin a package manager
 # do not download at run time. The last yarn installed becomes the default.
@@ -81,6 +81,33 @@ pnpm --version
 yarn --version
 nvm cache clear
 
+# --- browsers for tests: Firefox, geckodriver, Playwright --------------------
+# Ubuntu's firefox is a snap that does not run in a container, so use
+# Mozilla's own apt repository for the real binary.
+install -d -m 0755 /etc/apt/keyrings
+curl -fsSL https://packages.mozilla.org/apt/repo-signing-key.gpg \
+    -o /etc/apt/keyrings/packages.mozilla.org.asc
+echo "deb [signed-by=/etc/apt/keyrings/packages.mozilla.org.asc] https://packages.mozilla.org/apt mozilla main" \
+    > /etc/apt/sources.list.d/mozilla.list
+apt-get update
+apt-get -y install --no-install-recommends -t mozilla firefox
+
+# geckodriver, matched to Firefox at its current release.
+gd="$(latest_tag mozilla/geckodriver)"
+case "$arch" in
+    arm64) gd_arch=linux-aarch64 ;;
+    *) gd_arch=linux64 ;;
+esac
+curl -fsSL "https://github.com/mozilla/geckodriver/releases/download/${gd}/geckodriver-${gd}-${gd_arch}.tar.gz" |
+    tar -C /usr/local/bin -xz geckodriver
+
+# Playwright's Chromium and Firefox. WebKit has no linux-arm64 build, so it
+# is skipped. Playwright's Chromium is also the headless Chrome for
+# chromedp-style clients, exposed as `chromium` on PATH.
+playwright install --with-deps chromium firefox
+ln -s "$(ls -d "$PLAYWRIGHT_BROWSERS_PATH"/chromium-*/chrome-linux*/chrome | head -n1)" \
+    /usr/local/bin/chromium
+
 # --- pyenv, Python (latest), pip, virtualenv ---------------------------------
 git clone -q --depth 1 --branch "$PYENV_GIT_TAG" https://github.com/pyenv/pyenv.git "$PYENV_ROOT"
 rm -rf "$PYENV_ROOT/.git"
@@ -129,6 +156,10 @@ COREPACK_ENABLE_NETWORK=0 yarn --version
 COREPACK_ENABLE_NETWORK=0 pnpm --version
 wrangler --version
 prettier --version
+playwright --version
+firefox --version
+geckodriver --version
+chromium --version
 python3 --version
 pip --version
 virtualenv --version