feat(API): add route and implementation for creating/updating repository secret ...

feat(API): add route and implementation for creating/updating repository secret (#26766)

spec:
https://docs.github.com/en/rest/actions/secrets?apiVersion=2022-11-28#create-or-update-a-repository-secret

- Add a new route for creating or updating a secret value in a
repository
- Create a new file `routers/api/v1/repo/action.go` with the
implementation of the `CreateOrUpdateSecret` function
- Update the Swagger documentation for the `updateRepoSecret` operation
in the `v1_json.tmpl` template file

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Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
Co-authored-by: Giteabot <teabot@gitea.io>