[CI] Update Carvel packaging and deployment scripts.

[corneil]

Update to Carvel Packaging and deployment scripts. [skip ci]

[jvalkeal]

Was this meant to fix generated application.yml i.e

Having /tmp/scdf-values.yml

#@data/values
---
scdf:
  server:
    image:
      tag: 2.11.2-SNAPSHOT
  skipper:
    config:
      spring:
        cloud:
          skipper:
            server:
              platform:
                kubernetes:
                  accounts:
                    default:
                      environmentVariables: 'FOO=bar'
    image:
      tag: 2.11.2-SNAPSHOT
  ctr:
    image:
      tag: 2.11.2-SNAPSHOT

Then doing:

/repos/spring/spring-cloud-dataflow/prs/src/carvel [corneil-corneil/update-carve-deploy L|✔] 
15:41 $ ytt -f config -f /tmp/scdf-values.yml

Which in this pr still outputs(doesn't preserve defaults in environmentVariables):

apiVersion: v1
kind: ConfigMap
metadata:
  name: skipper
  labels:
    app: skipper
  annotations:
    kapp.k14s.io/versioned: ""
data:
  application.yaml: |
    spring:
      cloud:
        skipper:
          server:
            platform:
              kubernetes:
                accounts:
                  default:
                    environmentVariables: FOO=bar
                    limits:
                      memory: 1024Mi
                      cpu: 500m
                    readinessProbeDelay: 30
                    livenessProbeDelay: 15
                    imagePullSecret: reg-creds
      datasource:
        testOnBorrow: true
    management:
      metrics:
        export:
          prometheus:
            enabled: true
            rsocket:
              enabled: true
              host: prometheus-rsocket-proxy
              port: 7001

[corneil]

There is more work needed to externalise environment variables and specific Kubernetes properties.
The values file schema shouldn't match the task and batch config put provide a separate way for providing configuration which can then be merged with defaults.

At the moment just trying to ensure the default values files don't step on the environment variables.