Support the VCAP_APPLICATION version and application_version attributes

[georgethebeatle]

Background

We should support the version and application_version attrubutes of the VCAP_APPLICATOIN env var.

Acceptance

GIVEN I push an app that dumps the envirionment to Korifi

WHEN I access the app
THEN I can see version and application_version attributes in the VCAP_APPLICATION env var

WHEN I restart the app
THEN I can see that version and application_version have changed

Dev Notes

• On CF for VMs the version and application_version in the VCAP_APPLICATION env var are set to the process version.
• Looking at the cloud controller code there are certain rules that dictate when the process version should be changed.
• As of today the only rule that applies is the transition of the process from STOPPED to STARTED. These statuses look like they refer to the process, not the app. We do not have process statuses in korifi.
• Can we generate the version in the app revision webhook?

Output from mel-c

# from an ssh session on the app container
$ echo $VCAP_APPLICATION | jq .
{
  "version": "8f6e2e8a-93f3-490c-8021-462172cb77c7",
  "application_version": "8f6e2e8a-93f3-490c-8021-462172cb77c7"
}

❯ cf curl /v3/processes | jq '.resources[].version'
"8f6e2e8a-93f3-490c-8021-462172cb77c7"
"dc1003cf-4133-42d0-9428-c3f59c8cc302"