add option to set subdir on the PVC volume mount

[colearendt]

One thing that needs to be vetted: Does Launcher / the job launching process handle this subdir properly (and subdir below it?)... or will we need to pass this sub-directory along somehow?

Also need to:

• bump chart versions
• add NEWS entries

[jforest]

It looks good to me, and it would be great to get it out.

I'm happy to help test it in whatever way I can before I use it in my PR here: https://github.com/rstudio/aws-main-services/pull/625

[colearendt]

Tested a bit and things look good!

[dbkegley]

One thing that needs to be vetted: Does Launcher / the job launching process handle this subdir properly (and subdir below it?)... or will we need to pass this sub-directory along somehow?

When off-host is enabled for Connect, I don't think this setting will play nicely with Launcher.DataDirPVCName, which will not allow setting a subpath currently. Using this new setting with off-host enabled will likely cause the content datadir to be misaligned

"volumes": [
    {
      "name": "mount0",
      "persistentVolumeClaim": {
        "claimName": "connect-pvc"
      }
    },
...
],
"volumeMounts": [
    {
      "mountPath": "/opt/rstudio-connect/mnt/app",
      "name": "mount0",
      "subPath": "apps/1/1"
    },
...
  ]

In the above example, I think apps/1/1 should really be: <sharedStorage.subPath>/apps/1/1