also provide writable tmp volumes for db init check

[machisuji]

so used rails runner is guaranteed to work

specifically when appsignal is configured, it will try to write a log file and fail due to the read-only file system (if configured which it is by default)

This ought to fix the issue we are observing when appsignal is configured:

wait-for-db appsignal: Unable to log to '/app/log' or the '/tmp' fallback. Please check the permissions for the application's (log) directory.

It turns out, though, that this is not the main issue. The main issue is not appsignal at all but mini_magick since the latest update:

wait-for-db /usr/local/lib/ruby/3.4.0/tmpdir.rb:44:in 'Dir.tmpdir': could not find a temporary directory (ArgumentError)                                                                    
wait-for-db                                                                                                                                                               
wait-for-db     end or raise ArgumentError, "could not find a temporary directory"
wait-for-db                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                                                          
wait-for-db     from /app/vendor/bundle/ruby/3.4.0/gems/mini_magick-5.1.2/lib/mini_magick/configuration.rb:71:in 'MiniMagick::Configuration.extended'

Either way, adding the tmp volumes fixes both issues.

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Latest commit: 27a51ce

The changes in this PR will be included in the next version bump.

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@openproject/helm-charts	Minor

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