Don't replace the entrypoint - add to the current one (current method breaks nginx:alpine's startup scripts)

[Makeshift]

The official nginx:alpine docker entrypoint does something different to mine that gives worker process information etc. It might just be a verbosity flag, but having different output/behaviour between the two images is a bit annoying.

Rather than replace the entrypoint, I should add my script into /docker-entrypoint.d/ so it works with everything else on the official image.

[Makeshift]

Fixed.