[BUG] Deploy a basic application](https://microshift.io/docs/user-documentation/how-tos/example-usage/) doesn't work as expected

[wangke19]

What is not documented correctly:

Deploy a basic application doesn't work as expected, will hit the following errors,
$ oc apply -f https://raw.githubusercontent.com/metallb/metallb/v0.11.0/manifests/metallb.yaml
...
deployment.apps/controller created
resource mapping not found for name: "controller" namespace: "metallb-system" from "https://raw.githubusercontent.com/metallb/metallb/v0.11.0/manifests/metallb.yaml": no matches for kind "PodSecurityPolicy" in version "policy/v1beta1"
ensure CRDs are installed first
resource mapping not found for name: "speaker" namespace: "metallb-system" from "https://raw.githubusercontent.com/metallb/metallb/v0.11.0/manifests/metallb.yaml": no matches for kind "PodSecurityPolicy" in version "policy/v1beta1"

What you expected or propose to be documented:

We need to find an available solution for this example. For MicroShift, we don't have PodSecurityPolicy resource actually.
$ oc api-resources | grep -i PodSecurityPolicy

Environment:

• MicroShift version (use microshift version):
  $ microshift version
  MicroShift Version: 4.13.0_0.nightly_2023_02_23_000625_20230228165434_57b147ce
  Base OCP Version: 4.13.0-0.nightly-2023-02-23-000625

• Hardware configuration:

• OS (e.g: cat /etc/os-release):
  $ cat /etc/os-release
  NAME="Red Hat Enterprise Linux"
  VERSION="9.1 (Plow)"
  ID="rhel"
  ID_LIKE="fedora"
  VERSION_ID="9.1"
  PLATFORM_ID="platform:el9"
  PRETTY_NAME="Red Hat Enterprise Linux 9.1 (Plow)"
  ANSI_COLOR="0;31"
  LOGO="fedora-logo-icon"
  CPE_NAME="cpe:/o:redhat:enterprise_linux:9::baseos"
  HOME_URL="https://www.redhat.com/"
  DOCUMENTATION_URL="https://access.redhat.com/documentation/red_hat_enterprise_linux/9/"
  BUG_REPORT_URL="https://bugzilla.redhat.com/"

REDHAT_BUGZILLA_PRODUCT="Red Hat Enterprise Linux 9"
REDHAT_BUGZILLA_PRODUCT_VERSION=9.1
REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux"
REDHAT_SUPPORT_PRODUCT_VERSION="9.1"

• Kernel (e.g. uname -a):
  $ uname -a
  Linux dhcp-1-235-104.arm.eng.rdu2.redhat.com 5.14.0-162.18.1.el9_1.x86_64 Addoldrepo #1 SMP PREEMPT_DYNAMIC Thu Feb 9 04:28:41 EST 2023 x86_64 x86_64 x86_64 GNU/Linux

[dhellmann]

The PodSecurityPolicy API has been removed from Kubernetes, and therefore from MicroShift. See https://kubernetes.io/docs/concepts/security/pod-security-policy/ for details.

Perhaps a newer version of MetalLB does not require PSP?