Add support for ambient credentials detection in jenkins workflow

[KiranSatyaRaj]

Currently, the default way of signing artifacts is via WebAuthFlow

• The other way is through ambient credentials detection i.e using predefined oidc token in workflow environment for signing.
• The second method is only supported in Github Actions Workflow
• I propose to add support for second method in jenkins workflow as well

[KiranSatyaRaj]

(gentle ping) @loosebazooka