Hashicorp vault as secret storage integration

[Savemech]

Clear and concise description of the problem

Hi there, that would be awesome if secrets would be pullable from Hashicorp Vault, by integration like this

Suggested solution

by this https://docs.gitlab.com/ee/ci/secrets/index.html#configure-your-vault-server and that https://docs.gitlab.com/ee/ci/secrets/index.html#use-vault-secrets-in-a-ci-job

Alternative

wrapping stuff in bash, that's sad and nasty, because woodpecker does not treat it as concealed string, and secrets gets leaked import this onto woodpecker plugin system

Additional context

https://www.hashicorp.com/resources/securing-your-ci-pipeline-with-vault

Validations

• [X] Read the Contributing Guidelines.
• [X] Read the docs.
• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.