[AIRFLOW-XXXX] Add Tink as an Airflow user

[nikhilnadig28]

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Issue link: Document only change, no JIRA issue

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• Description above provides context of the change
• Commit message/PR title starts with [AIRFLOW-NNNN]. AIRFLOW-NNNN = JIRA ID^*
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• Relevant documentation is updated including usage instructions.
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^* For document-only changes commit message can start with [AIRFLOW-XXXX].

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[boring-cyborg]

Awesome work, congrats on your first merged pull request!