[TT-9571] enterprise-portal: assign /tmp/tyk-portal to TMPDIR environment variable

[edsonmichaque]

Description

To upload files using multi-part form in enterprise-portal we need to have write permission to /tmp, but the filesystem is mounted read-only.

We found that there is a volume mounted RW in /tmp/tyk-portal, this PR defines the environment variable TMPDIR to point to this directory. This way, whenever the portal needs to write a temporary file, it will use the directory pointed by the variable.

Related Issue

Motivation and Context

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Refactoring or add test (improvements in base code or adds test coverage to functionality)
• Documentation updates or improvements.

Checklist

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• My change requires a change to the documentation.
  • I have manually updated the README(s)/documentation accordingly.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[padiazg]

I think we can take another approach to fix this issue, and try to make the Portal really stateless

[edsonmichaque]

Thanks @padiazg, let me close it then