Add a Terraform provider that manages the Gitea token secrets engine
(vault-plugin-secrets-gitea) on Vault/OpenBao, so terraform-vault can drive
the engine's mount, config, and roles declaratively.
- add the provider (source git.unkin.net/unkin/giteavaultsecret, prefix gitea_)
- add gitea_secret_backend (mount + config with seeded admin credentials)
- add gitea_secret_backend_role (username, scopes list, ttls, token_name_prefix)
- add the Vault API client plumbing, conversions, and unit tests
- add examples, a real terraform+Vault+mock-Gitea e2e, and Woodpecker pipelines
releasing the provider zip to the artifactapi terraform registry
Claude-Session: https://claude.ai/code/session_015ur3i7D2azsMAWTSVABApv
