build: fix linux libc issues

[didroe]

Description

Fix linux libc issues by dynamically linking, and by building against an old version of libc.

Makes linux builds run inside a container where we can control the base image. We use Ubuntu 18.04 as this is the earliest version that we can (easily) run docker buildx on.

Checklist

• I've added test coverage that shows my fix or feature works as expected.
• I've updated or added documentation if required.
• I've included usage information in the description if CLI behavior was updated or added.
• PR title follows Conventional Commits format