Update jwt-secret-init-job.yaml

[merlimat]

Motivation

Use /tmp/ directory for writing scripts, to avoid permission issues.

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[lhotari]

Use /tmp/ directory for writing scripts, to avoid permission issues.

btw. Some environments might prevent script execution from /tmp with noexec mount option. That's rare. In those environments loading native libraries (for example tcnative) from /tmp is also prevented.