Migrate to metal-apiserver with backwards compatibility. - #51

buildx failed with: ERROR: failed to build: failed to solve: process "/bin/sh -c apt update && apt install --yes --no-install-recommends ca-certificates gcc git libc6-dev liblzma-dev make && make ipxe" did not complete successfully: exit code: 100

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/setup-go@v5, docker/build-push-action@v6, docker/login-action@v3, docker/setup-buildx-action@v3, golangci/golangci-lint-action@v8. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/