Fix image builds + publish new kernel configs

[stealthybox]

Changes:

• Fix kubeadm image build to support multi-arch
  1. Copy build context when mutating Dockerfile for cross-builds + cleanup
  2. Pass GOARCH as build-arg to support local, dependent, multi-arch images
     in FROM statements
  3. Parameterize build-args for k8s RELEASE and
     BINARY_REF
  4. Update install.sh to take GOARCH as a 4th commandline param
• Add load into containerd for image Make

The following build now passes and is idempotent on my machine:

make -C images/alpine alpine.tar
make -C images build-all

make -C images/kernel upgrade

make -C images/kernel build
make -C images/kernel GOARCH=arm64 build

make -C images ctr-import-all
make -C images/kernel ctr-import
make -C images/kernel ctr-import GOARCH=arm64

[luxas]

Thanks, looks good!