CI: install Chromium

Author: pjonsson

.github/workflows/test.yml

@@ -10,6 +10,8 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: ianwalter/playwright-container@43940dfa7d309fe3569b9df407ae9e84dcbf2e7f
+      - name: install Chromium
+        run: 'apt-get install -y --no-install-recommends chromium'
       - name: ⚙ bootstrap
         run: 'npm run bootstrap && npx _check_deps && npx _add_plugin_indexes'
       - name: 📐 types