Add users to OpenShift via htpasswd

add_users_to_openshift.sh

#!/bin/bash

# create admin and user1 with password `openshift`
#   -c for file, -n just for console
#   -B for bcrypt
#   -b for allowing password in command
htpasswd -c -B -b ./openshift.htpasswd admin openshift
htpasswd -B -b ./openshift.htpasswd user1 openshift

# add secret with username/passwords
oc create secret generic htpass-secret --from-file=htpasswd=./openshift.htpasswd -n openshift-config 

# setup identity provider to use that secret
cat <<EOF | oc create -f -
apiVersion: config.openshift.io/v1
kind: OAuth
metadata:
  name: cluster
spec:
  identityProviders:
  - name: my_htpasswd_provider 
    mappingMethod: claim 
    type: HTPasswd
    htpasswd:
      fileData:
        name: htpass-secret 
EOF

# make cluster admin afterwards
oc adm policy add-cluster-role-to-user cluster-admin admin

Taken from: https://docs.openshift.com/container-platform/4.12/authentication/identity_providers/configuring-htpasswd-identity-provider.html