Upgrade Node to 22.23.4 and remove the wildcard image host - #175

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: docker/build-push-action@v6.19.2, docker/login-action@v3.7.0, docker/setup-buildx-action@v3.12.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/