nginx image is not being tracked by renovate

[noahpb]

It appears that the nginx image used in this project was mirrored to our ghcr as a one-time workaround for public Dockerhub rate limiting. The image is now two minor versions behind.

We should create a long-term plan for keeping this image up to date. Perhaps creating an automated build pipeline or using a "unicorn" flavor of this image is a viable solution. The end result should include the usage of an nginx image that is regularly udpated and renovate should be configured to track updates.

[noahpb]

Just saw @mjnagel's branch nginx-update. This should satisfy the issue.

[mjnagel]

Was just typing a comment on here - I think using Chainguard's latest + pinning to a sha is a smart path forward. I think I encountered some issues with that update though - possibly due to missing binaries in the chainguard image if I remember right? I didn't have enough time to poke at that more - but if that is truly a problem we could probably make a pipeline to mirror images here.