I ended up not using Job2Docker in favour of a simple docker process.

1. Build the Talend Standalone job.
2. Unzip the build into a folder called jobs.
3. Use the below Dockerfile example to build and push your docker image.

Dockerfile

FROM java
WORKDIR /talend
COPY ./jobs /talend

Create a CronJob type for K8s

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: etl-edw-cronjob
spec:
  schedule: "0 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          restartPolicy: Never
          containers:
            - name: etl-edw-job
              image: dockerhubrepo/your-etl
              command: ["sh",  "./process_data_warehouse_0.1/process_data_warehouse/process_data_warehouse_run.sh"]
              env:
                - name: PGHOST
                  value: postgres-cluster-ip-service
                - name: PGPORT
                  value: "5432"
                - name: PGDATABASE
                  value: infohub
                - name: PGUSER
                  value: postgres
                - name: PGPASSWORD
                  valueFrom:
                    secretKeyRef:
                      name: pgpassword
                      key: PGPASSWORD
                - name: MONGOSERVER
                  value: mongo-service
                - name: MONGOPORT
                  value: "27017"
                - name: MONGODB
                  value: hearth