Broker not found in Kubernetes deployment

I'm trying to deploy rocketmq on my testing cluster. I started from the scripts provided in that repo, but they do not work. I modified them in the following way:
```yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: rocketmq-namesrv
spec:
replicas: 1
selector:
matchLabels:
app: rocketmq-namesrv
template:
metadata:
labels:
app: rocketmq-namesrv
spec:
containers:
- name: namesrv
image: myrepo/rocketmq:4.9.3-alpine
command: ["sh", "mqnamesrv"]
imagePullPolicy: IfNotPresent
resources:
limits:
memory: "128Mi"
cpu: "400m"
ports:
- containerPort: 9876
volumeMounts:
- name: namesrv-log
mountPath: /var/log
volumes:
- name: namesrv-log
persistentVolumeClaim:
claimName: rocketmq-namesrv-pvc

---

apiVersion: apps/v1
kind: Deployment
metadata:
name: rocketmq-broker
spec:
replicas: 1
selector:
matchLabels:
app: rocketmq-broker
template:
metadata:
labels:
app: rocketmq-broker
spec:
containers:
- name: broker
image: myrepo/rocketmq:4.9.3-alpine
command: ["sh", "mqbroker", "-n", "localhost:9876"]
imagePullPolicy: IfNotPresent
resources:
limits:
memory: "128Mi"
cpu: "400m"
ports:
- containerPort: 10909
- containerPort: 10911
volumeMounts:
- name: broker-log
mountPath: /var/log
- name: broker-store
mountPath: /home/rocketmq
volumes:
- name: broker-log
persistentVolumeClaim:
claimName: rocketmq-broker-log-pvc
- name: broker-store
persistentVolumeClaim:
claimName: rocketmq-broker-store-pvc
```

The image `rocketmq:4.9.3-alpine` was created following the procedure on that repo.

After the deployment the rocketmq-namesrv works, but the broker's pod logs: `sh: can't open 'mqbroker': No such file or directory`...

_What could it be? Am I making something wrong?_