feat(findmydevice): Build patched image in CI

This patch provides my adjusted image as part of the GitOps Repository
CI. The image was patched to listen on an unprivileged port by default.
It patches the go code, since the providing the configfile is untrivial
to provide as configmap and environment variables are no option.

Otherwise the Earthfile reproduces the upstream Dockerfile.

References:
https://gitlab.com/Nulide/findmydeviceserver/-/blob/210898cbe631663cf42cbb1f05fd09384913a6aa/Dockerfile
https://www.w3.org/Daemon/User/Installation/PrivilegedPorts.html