Missing /etc/mime.types

[lucasfcnunes]

As @mrksngl stated in 2021 /etc/mime.types is not present in the latest image (#7728 (comment)).

registry.k8s.io/ingress-nginx/nginx-errors:v20230404-helm-chart-4.6.0-11-gc76179c04 @ https://console.cloud.google.com/gcr/images/k8s-artifacts-prod/us/ingress-nginx/nginx-errors

Impact on e.g. curl --request GET --url http://localhost:8080/ --header 'X-Format: application/rss+xml'

with /etc/mime.types

unexpected error opening file: open /www/404.rss: no such file or directory
unexpected error opening file: open /www/4xx.rss: no such file or directory
http: superfluous response.WriteHeader call from main.errorHandler.func1 (main.go:164)

without mime /etc/mime.types

couldn't get media type extension. Using .htm
unexpected error reading return code: strconv.Atoi: parsing "": invalid syntax. Using 404
serving custom error response for code 404 and format application/rss+xml from file /www/404.html

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