Only changing the image does not update the instance group

[manno]

Describe the bug

Only changing the image, does not create a new bpm secret, so the qsts is not updated.

As a workaround, one could add a label to the env.bosh.agent.labels like the kubecf release does.

To Reproduce

After installing kubecf 2.7.12 use upgrade to modify only the image:

helm upgrade kubecf -n kubecf --values values.yaml kubecf-v2.7.12.tgz --set 'operations.custom={uaa-dev}'

Expected behavior

The pods should restart with the correct image.

See discussion on Slack: https://cloudfoundry.slack.com/archives/C1BQKKNP4/p1612893806008200

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/176902103

The labels on this github issue will be updated when the story is started.