Backport of ci: pull secrets from Vault in nomad-enterprise into release/1.3.x #17844
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Backport
This PR is auto-generated from #17841 to be assessed for backporting due to the inclusion of the label backport/1.3.x.
The below text is copied from the body of the original PR.
Now that (most) secrets-requiring workflows run on self-hosted runners in nomad-enterprise (#17775), we're able to (conditionally) pull secrets from our internal CI Vault cluster.
The approach here uses a composite action to avoid repetitive boilerplate, which also means it needs* to set secrets as env vars (also the default behavior of hashicorp/vault-action, and common practice in other projects, sans the composite action). Otherwise, it would require an odd maneuver, for GHA reasons, to have the composite output a dynamic map instead (*but it is possible, if we really want to. ask me how if you'd like).
As with the aforementioned PR, this is here in OSS Nomad repo to avoid merge conflicts with enterprise. I've pre-tested the workflows there, so hopefully no runtime surprises when we go to merge oss->ent.