add nginx-bitnami

[Dentrax]

Signed-off-by: Dentrax furkan.turkal@chainguard.dev<!---
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[EyeCantCU]

I believe nginx-stable should also be updated

[EyeCantCU]

Let's run the postunpack script like we do for other bitnami packages: https://github.com/bitnami/containers/blob/main/bitnami/nginx/1.27/debian-12/rootfs/opt/bitnami/scripts/nginx/postunpack.sh

[EyeCantCU]

Should only be 1