name: 'Install Yarn'
description: 'Enable Corepack and install the pinned Yarn version, with retries'
runs:
  using: 'composite'
  steps:
    - name: Install Yarn
      shell: bash
      # https://yarnpkg.com/getting-started/install
      #
      # `corepack enable` only sets up the shims - Corepack downloads the
      # pinned Yarn version from repo.yarnpkg.com on first use. That fetch has
      # a short timeout and no built-in retry, so a transient network blip on
      # CI fails the whole job. Prepare it eagerly with a retry loop.
      env:
        COREPACK_NETWORK_TIMEOUT: '60000'
      run: |
        corepack enable
        for i in 1 2 3; do
          corepack prepare --activate && break
          echo "corepack prepare failed (attempt $i), retrying in 15s..."
          sleep 15
        done