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### Description of the change
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remove deployment, `serviceName`
### Benefits
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### Possible drawbacks
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### Applicable issues
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- fixes#466
### Additional information
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### ⚠ BREAKING
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### Checklist
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- [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)
- [x] Breaking changes are documented in the `README.md`
- [x] Templating unittests are added
Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/467
Co-authored-by: yinheli <me@yinheli.com>
Co-committed-by: yinheli <me@yinheli.com>
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