Update tests and images

.github/workflows/kubernetes.yml

.github/workflows/nomad.yml

dind/Dockerfile

kubernetes/tests/files/vault-values.yaml

kubernetes/tests/main.hcl

kubernetes/tests/test/single_k3s_cluster.feature

main.hcl

nomad/Dockerfile

nomad/files/nomad.conf

nomad/files/nomad.sh

nomad/tests/files/example.nomad

nomad/tests/main.hcl

nomad/tests/test/single_nomad_cluster.feature

pind/Dockerfile

pind/files/docker.conf

pind/files/dockerd.sh

pind/files/supervisord.conf