Use minimal configuration for fresh Ship installations - #4

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683, actions/setup-node@39370e3970a6d050c480ffad4ff0ed4d3fdee5af, docker/build-push-action@4f58ea79222b3b9dc2c8bbdd6debcef730109a75, docker/setup-buildx-action@c47758b77c9736f4b2ef4073d4d51994fabfe349. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/