### Description of the change
Fix a wrong reference to `signing.existingKey`, `signing.existingSecret` was what was meant and what is used in the chart.
### Benefits
Less confusion when trying to use the Helm chart.
### Possible drawbacks
Evangelists of `existingKey` storming the barricades even though `existingKey` is long dead.
### Applicable issues
None, nobody noticed enough to care, apparently.
Co-authored-by: Tobias Wolter <towo@towo.eu>
Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/415
Reviewed-by: pat-s <pat-s@noreply.gitea.io>
Reviewed-by: justusbunsi <justusbunsi@noreply.gitea.io>
Co-authored-by: towo <towo@noreply.gitea.io>
Co-committed-by: towo <towo@noreply.gitea.io>
### Description of the change
This PR adds support for gpg key setup. It allows to pass the gpg private key content inline inside `values.yaml` or refer to an existing secret containing the key content data.
### Benefits
Administrators don't need to manually setup the gpg environment from inside a running container. It also eliminates the breaking change of Gitea 1.17 regarding `[git].HOME` as the `GNUPGHOME` environment variable is used consistently to relocate the `.gnupg` directory to its former location.
### Applicable issues
- fixes#107
### Additional information
This PR add the first unit tests to this Helm Chart, ensuring templating integrity for signing related configuration.
### Checklist
- [x] Parameters are documented in the `values.yaml` and added to the `README.md` using [readme-generator-for-helm](https://github.com/bitnami-labs/readme-generator-for-helm)
Co-authored-by: justusbunsi <sk.bunsenbrenner@gmail.com>
Co-authored-by: pat-s <pat-s@noreply.gitea.io>
Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/343
Reviewed-by: luhahn <luhahn@noreply.gitea.io>
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: justusbunsi <justusbunsi@noreply.gitea.io>
Co-committed-by: justusbunsi <justusbunsi@noreply.gitea.io>
