feat: create user with default policy

[jiuker]

fix #1870
how to test:
set use with

apiVersion: v1
kind: Secret
metadata:
  name: mytest-minio-user-0
  namespace: minio-system
  labels:
    v1.min.io/tenant: mytest-minio
immutable: true
type: Opaque
data:
  CONSOLE_ACCESS_KEY: bXlhZG1pbmNvbnNvbGU=
  CONSOLE_SECRET_KEY: cGFzc3dvcmRjb25zb2xl
  MyUser_ACCESS_KEY: bXlhZG1pbg==
  MyUser_SECRET_KEY: cGFzc3dvcmQ=
  MyUser_POLICY: cmVhZG9ubHk=

User info:

    CONSOLE_ACCESS_KEY: myadminconsole
    CONSOLE_SECRET_KEY: passwordconsole
    MyUser_ACCESS_KEY: myadmin
    MyUser_SECRET_KEY: password
    MyUser_POLICY: readonly

[shtripat]

I followed below steps

1. docker buildx build --no-cache -o type=docker -t docker.io/minio/operator:create-user .
2. kind create cluster --config ./kind-config.yaml
3. kind load docker-image docker.io/minio/operator:create-user
4. kubectl kustomize . > operator-test.yaml and changed the image name to docker.io/minio/operator:create-user in YAML
5. kubectl apply -f operator-test.yaml
6. kubectl kustomize ./examples/kustomization/tenant-lite/ > tenant-u.yaml
7. Added below content additionally to the YAML

apiVersion: v1
kind: Secret
metadata:
  name: mytest-minio-user-0
  namespace: tenant-lite
  labels:
    v1.min.io/tenant: myminio
immutable: true
type: Opaque
data:
    CONSOLE_ACCESS_KEY: bXlhZG1pbmNvbnNvbGUK
    CONSOLE_SECRET_KEY: cGFzc3dvcmRjb25zb2xlCg==
    MyUser_ACCESS_KEY: bXlhZG1pbgo=
    MyUser_SECRET_KEY: cGFzc3dvcmQK
    MyUser_POLICY: readonly

8. kubectl apply -f tenant-u.yaml

I can see secret created but unable to create alias using the creds myadmin and password. Please add detailed steps for verification and sample YAMLs.

[jiuker]

Use

 CONSOLE_ACCESS_KEY: bXlhZG1pbmNvbnNvbGU=
  CONSOLE_SECRET_KEY: cGFzc3dvcmRjb25zb2xl
  MyUser_ACCESS_KEY: bXlhZG1pbg==
  MyUser_SECRET_KEY: cGFzc3dvcmQ=
  MyUser_POLICY: cmVhZG9ubHk=

instead. Value should be base64.

[shtripat]

Use

 CONSOLE_ACCESS_KEY: bXlhZG1pbmNvbnNvbGU=
  CONSOLE_SECRET_KEY: cGFzc3dvcmRjb25zb2xl
  MyUser_ACCESS_KEY: bXlhZG1pbg==
  MyUser_SECRET_KEY: cGFzc3dvcmQ=
  MyUser_POLICY: cmVhZG9ubHk=

instead. Value should be base64.

We need to add new user to the users list as well in tenant YAML for this change to work as below

  users:
  - name: storage-user
  - name: mytest-minio-user-0

[jiuker]

Job CRD to do this.