[RayCluster][Feature] add redis username to head pod from GcsFaultToleranceOptions

[win5923]

Why are these changes needed?

This PR addresses the following selected part:

Currently, the example YAML file for GCS FT has Redis version 5.0.9, which does not support ACL. This causes a CrashLoopBackOff when setting redisUsername.

Ref: https://redis.io/docs/latest/operate/oss_and_stack/management/security/acl/

Manual Tests

kind: ConfigMap
apiVersion: v1
metadata:
  name: redis-config
  labels:
    app: redis
data:
  redis.conf: |-
    dir /data
    port 6379
    bind 0.0.0.0
    appendonly yes
    protected-mode no
    requirepass 5241590000000000
    pidfile /data/redis-6379.pid

    user username on >5241590000000000 ~* +@all
---
apiVersion: v1
kind: Service
metadata:
  name: redis
  labels:
    app: redis
spec:
  type: ClusterIP
  ports:
    - name: redis
      port: 6379
  selector:
    app: redis
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis
  labels:
    app: redis
spec:
  replicas: 1
  selector:
    matchLabels:
      app: redis
  template:
    metadata:
      labels:
        app: redis
    spec:
      containers:
        - name: redis
          image: redis:7.4.2 <--- Use the version that supports ACL.
          command:
            - "sh"
            - "-c"
            - "redis-server /usr/local/etc/redis/redis.conf"
          ports:
            - containerPort: 6379
          volumeMounts:
            - name: config
              mountPath: /usr/local/etc/redis/redis.conf
              subPath: redis.conf
      volumes:
        - name: config
          configMap:
            name: redis-config
---
# Redis password
apiVersion: v1
kind: Secret
metadata:
  name: redis-password-secret
type: Opaque
data:
  # echo -n "username" | base64
  # echo -n "5241590000000000" | base64
  username: dXNlcm5hbWU=
  password: NTI0MTU5MDAwMDAwMDAwMA==
---
apiVersion: ray.io/v1
kind: RayCluster
metadata:
  name: raycluster-external-redis-3
spec:
  rayVersion: 'nightly'
  gcsFaultToleranceOptions:
    redisAddress: redis:6379
    redisUsername:
      valueFrom:
        secretKeyRef:
          name: redis-password-secret
          key: username
    redisPassword:
      valueFrom:
        secretKeyRef:
          name: redis-password-secret
          key: password
  headGroupSpec:
    rayStartParams:
      num-cpus: "0"
    template:
      spec:
        containers:
          - name: ray-head
            image: rayproject/ray:nightly
            resources:
              limits:
                cpu: "1"
              requests:
                cpu: "1"
            ports:
              - containerPort: 6379
                name: redis
              - containerPort: 8265
                name: dashboard
              - containerPort: 10001
                name: client
            volumeMounts:
              - mountPath: /tmp/ray
                name: ray-logs
              - mountPath: /home/ray/samples
                name: ray-example-configmap
        volumes:
          - name: ray-logs
            emptyDir: {}
          - name: ray-example-configmap
            configMap:
              name: ray-example
              defaultMode: 0777
              items:
                - key: detached_actor.py
                  path: detached_actor.py
                - key: increment_counter.py
                  path: increment_counter.py
  workerGroupSpecs:
    - replicas: 1
      minReplicas: 1
      maxReplicas: 10
      groupName: small-group
      rayStartParams: {}
      template:
        spec:
          containers:
            - name: ray-worker
              image: rayproject/ray:nightly
              volumeMounts:
                - mountPath: /tmp/ray
                  name: ray-logs
              resources:
                limits:
                  cpu: "1"
                requests:
                  cpu: "1"
          volumes:
            - name: ray-logs
              emptyDir: {}
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: ray-example
data:
  detached_actor.py: |
    import ray

    @ray.remote(num_cpus=1)
    class Counter:
      def __init__(self):
          self.value = 0

      def increment(self):
          self.value += 1
          return self.value

    ray.init(namespace="default_namespace")
    Counter.options(name="counter_actor", lifetime="detached").remote()
  increment_counter.py: |
    import ray

    ray.init(namespace="default_namespace")
    counter = ray.get_actor("counter_actor")
    print(ray.get(counter.increment.remote()))

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: ray-example
data:
  detached_actor.py: |
    import ray

    @ray.remote(num_cpus=1)
    class Counter:
      def __init__(self):
          self.value = 0

      def increment(self):
          self.value += 1
          return self.value

    ray.init(namespace="default_namespace")
    Counter.options(name="counter_actor", lifetime="detached").remote()
  increment_counter.py: |
    import ray

    ray.init(namespace="default_namespace")
    counter = ray.get_actor("counter_actor")
    print(ray.get(counter.increment.remote()))

Related issue number

Resolves #2720

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • This PR is not tested :(

[win5923]

@rueian PTAL when you are free