add tmp dir mount everywhere

[monotek]

What this PR does / why we need it

• add tmp dir mount everywhere
• update zammad to 6.0.0-76

Which issue this PR fixes

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

• fixes #

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

[mgruner]

@monotek not sure if I fully understand this correctly. But why do you think that tmp/ needs to be shared in the cluster?

[monotek]

i saw some tmp related logs.
not sure if it helps.
just testing.

[mgruner]

If you find something in tmp/ that needs to be shared in the cluster, we need to look at it. Only var/ should need to be shared at this point.
Only local stuff should get written in tmp/.

[monotek]

I'll check for the error messages later.
Have to work now...

[monotek]

superseeded by: #215