Deployment invalid: spec.template.metadata.labels: Invalid value

You need to add selector in spec of Deployment.

And also, these selector should match with labels in PodTemplate.

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: moverick-mule-pre
spec:
  replicas: 2
  selector:
    matchLabels:
      app: moverick-mule-pre
      commit: $CI_COMMIT_SHA
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
  template:
    metadata:
      labels:
        app: moverick-mule-pre
        commit: $CI_COMMIT_SHA

Otherwise, you will get error like below

The Deployment “moverick-mule-pre” is invalid:

• spec.selector: Required value
• spec.template.metadata.labels: Invalid value: map[string]string{…} selector does not match template labels