build(docker): id command fails to lookup uid 100

[lklimek]

Issue being fixed or feature implemented

Before creating tmuser, we need to ensure user with id 100 does not exist.
We can't simply allocate new user id, as existing installs already have data owned by uid 100.

Unfortunately, id command fails to lookup the user with error:

id: unknown user 100

What was done?

replaced malfunctioning id -nu 100 with awk

How Has This Been Tested?

Local build with docker buildx build -f DOCKER/Dockerfile .

Green GHA: https://github.com/dashpay/tenderdash/actions/runs/21390972670

Breaking Changes

None

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

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