Generate JWT for authentication and provide it to CI jobs

Merged Krasimir Angelov requested to merge 207125-ci-jwt-auth into master

What does this MR do?

Generate JWT that can be used for authentication with 3rd parties that support JWT authentication (e.g. Vault - https://www.vaultproject.io/docs/auth/jwt/#jwt-authentication) and provide it to jobs as CI_JOB_JWT predefined CI variable.

See #207125 (closed).

Screenshots

Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

  • Label as security and @ mention @gitlab-com/gl-security/appsec
  • The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • Security reports checked/validated by a reviewer from the AppSec team
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