docker run gives exec /main: no such file or directory when the file exists

Here's my Dockerfile:

FROM alpine:latest
COPY ./main .
COPY ./configs/. .
EXPOSE 8081
CMD ["/main"]

If I do docker run -it --entrypoint=/bin/sh metadata I can see the /main file is there and is executable

/ # ls -lart /main
-rwxrwxr-x    1 root     root      15352712 May 29 19:16 /main

This is a Go binary so there are no unsatisfied dependencies.

When I try to run it it says that the /main file doesn't exist, even though it is there:

$ docker run -p 8081:8081 -it metadata
exec /main: no such file or directory

Is this a bug in docker?

I'm running docker 20.10.21 on Ubuntu 22.04.

--Edit--

I've tried running the /main binary from within docker and the Alpine distro can't find it to exec it:

$ docker run -it --entrypoint=/bin/sh metadata
/ # ls -l /main
-rwxrwxr-x    1 root     root      15352712 May 29 19:16 /main
/ # /main
/bin/sh: /main: not found
/ # ls
base.yaml  dev        home       main       mnt        proc       run        srv        tmp        var
bin        etc        lib        media      opt        root       sbin       sys        usr
/ # ./main
/bin/sh: ./main: not found
/ # main
/bin/sh: main: not found

I solved this with

FROM ubuntu:22.04

It looks like alpine is not compatible with my binary.