feat(core): add 13 checks of Kubernetes Core service

[MrCloudSec]

Description

Add 13 checks of Kubernetes Core service:

[core_minimize_admission_hostport_containers] Minimize the admission of containers which use HostPorts - Core [high]
[core_minimize_admission_windows_hostprocess_containers] Minimize the admission of Windows HostProcess Containers - Core [high]
[core_minimize_allowPrivilegeEscalation_containers] Minimize the admission of containers with allowPrivilegeEscalation - Core [high]
[core_minimize_containers_added_capabilities] Minimize the admission of containers with added capabilities - Core [high]
[core_minimize_containers_capabilities_assigned] Minimize the admission of containers with capabilities assigned - Core [high]
[core_minimize_hostIPC_containers] Minimize the admission of containers wishing to share the host IPC namespace - Core [high]
[core_minimize_hostNetwork_containers] Minimize the admission of containers wishing to share the host network namespace - Core [high]
[core_minimize_hostPID_containers] Minimize the admission of containers wishing to share the host process ID namespace - Core [high]
[core_minimize_net_raw_capability_admission] Minimize the admission of containers with the NET_RAW capability - Core [high]
[core_minimize_privileged_containers] Minimize the admission of privileged containers - Core [high]
[core_minimize_root_containers_admission] Minimize the admission of root containers - Core [high]
[core_no_secrets_envs] Prefer using secrets as files over secrets as environment variables - Core [medium]
[core_seccomp_profile_docker_default] Ensure that the seccomp profile is set to docker/default in your pod definitions - Core [high]

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[jfagoagas]

Great job @sergargar !!

Please review all the checks here https://docs.bridgecrew.io/docs/kubernetes-policy-index to add it to the metadata files in the IaC section.

[jfagoagas]

Another one ready to be merged!!

Thanks for the effort @sergargar 🏅