ci: Add tarball release workflow

[cpswan]

Fixes #4

@JeremyTubongbanua do you need an MD5 hash? We don't use them elsewhere.

- What I did

• Fixed example to build with relocated uuid4.h
• Added example binary to gitignore
• Created a workflow that builds a tarball, generates SHA256 hash, and creates attestations
• Bumped version to 1.0.4 in anticipation of a release that will use the new workflow
• Added v1.0.3 and 1.0.4 changes to CHANGELOG and reformatted to pass markdown lint

- How I did it

Workflow based on at_c c_release

- How to verify it

Do a release of v1.0.4 once this is merged

- Description for the changelog

ci: Add tarball release workflow