Get task git-access-token from Key Vault

[infbase]

What is the problem you're trying to solve The lifecycle of a git-access-token configured in a task's source triggers may be different from that of the task. This means that sooner or later, that token may expire and need to be renewed, for instance. If a single token is used in multiple tasks, this forces updating each individual task, possibly days after the token has expired.

Describe the solution you'd like It should be possible to retrieve this token from a Key Vault (like other secrets used in tasks), allowing for a single secret to be managed and taking advantage of the secret management features already available in Key Vaults.

[github-actions[bot]]

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