mount var volume to storage dir too

[monotek]

What this PR does / why we need it

• mount var volume too /opt/zammad/storage too
• set postgres init readOnlyRootFilesystem to false
• update zammad to 6.0.0-66
• update dependency charts
• extend upgrading docs a bit

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes
  • postgresql init issue after upgrade #191
  • Storage path after upgrade zammad to 6.X #196
  • Can not add Logo at setup or in settings #200
  • Existing volumeclaim creates volume with wrong name #201

Special notes for your reviewer

• .

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• Chart Version bumped
• Upgrading instructions are documented in the README.md

[rhizoet]

Is it possible to merge this soon? Or what are you waiting for?

[monotek]

I want to put the storage config in separate vars.
Had no time yet.
Sorry.

[rhizoet]

All good. Don't stress yourself. It was purely out of interest ;-)
Thank you for your hard work.