Add a nginx reverse proxy in front of the API
It will allow to:
1. serve the assets directly
2. cache the responses

The `image:` should point to the official nginx docker image
The nginx config can be generated as a [ConfigMap](https://kubernetes.io/docs/concepts/configuration/configmap/):
- see https://github.com/huggingface/gitaly-internals/blob/main/kube/gitaly/templates/gitaly/config.yaml
- [mounted](https://github.com/huggingface/gitaly-internals/blob/d7e20a22bac939c1ab49d1a15e5523d2b3015cdd/kube/gitaly/templates/gitaly/statefulset.yaml#L106-L108) as a [volume](https://github.com/huggingface/gitaly-internals/blob/d7e20a22bac939c1ab49d1a15e5523d2b3015cdd/kube/gitaly/templates/gitaly/statefulset.yaml#L124-L128)
- see https://github.com/huggingface/datasets-server/blob/af9a93d4b810c2353de01369ad49f2065272af85/services/api/INSTALL.md for the content of the config (cache + assets/)

Add a nginx reverse proxy in front of the API: It will allow to:
1. serve the assets directly
2. cache the responses

The `image:` should point to the official nginx docker image
The nginx config can be generated as a [ConfigMap](https://kubernetes.io/docs/concepts/configuration/configmap/):
- see https://github.com/huggingface/gitaly-internals/blob/main/kube/gitaly/templates/gitaly/config.yaml
- [mounted](https://github.com/huggingface/gitaly-internals/blob/d7e20a22bac939c1ab49d1a15e5523d2b3015cdd/kube/gitaly/templates/gitaly/statefulset.yaml#L106-L108) as a [volume](https://github.com/huggingface/gitaly-internals/blob/d7e20a22bac939c1ab49d1a15e5523d2b3015cdd/kube/gitaly/templates/gitaly/statefulset.yaml#L124-L128)
- see https://github.com/huggingface/datasets-server/blob/af9a93d4b810c2353de01369ad49f2065272af85/services/api/INSTALL.md for the content of the config (cache + assets/)
