docs/code-samples/serving/grpc-ping-go/service.yaml

apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: grpc-ping
  namespace: default
spec:
  template:
    spec:
      containers:
      - image: docker.io/{username}/grpc-ping-go
        ports:
          - name: h2c
            containerPort: 8080