Fix Playwright Chromium shard setup for test (chrome, chromium) job

[Copilot]

The test (chrome, chromium) Actions job failed because Playwright could not find chromium_headless_shell at runtime. The workflow now installs the correct Chromium shell binary for Chromium-based shards before running regression tests.

• Root cause

  • Chromium matrix jobs installed chromium but did not guarantee chromium_headless_shell, which Playwright attempted to launch in CI.

• Workflow change

  • Updated .github/workflows/test-regressions.yml browser install step to branch on matrix project:
    • chromium shards install shell-only Chromium runtime.
    • non-Chromium shards keep existing per-project install behavior.

• Resulting behavior

  • chrome/edge shards now provision the executable path Playwright expects, avoiding launch-time binary-missing failures.

- name: Install Playwright Browsers
  run: |
    if [ "${{ matrix.shard.project }}" = "chromium" ]; then
      pnpm core exec playwright install --only-shell chromium
    else
      pnpm core exec playwright install ${{ matrix.shard.project }}
    fi

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Project	Deployment	Actions	Updated (UTC)
vapor-ui	Ready	Preview, Comment	Jun 15, 2026 1:53am

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