Fix all memory issues
Fix invalid memory access

And free scanner when done.
Add build file for creating new Alpine repos
Keep building only for Alpine 3.19

New versions are no longer backwards compatible due Hare stdlib changes.
Adapt to Hare stdlib changes
Add build for releasing 3.18 packages
Add build manifest for new Alpine versions

Must be run manually once to create a repo for a new Alpine release.
Simplify interface to final intended form
Use intended final syntax for apk-index-update
Always read new index from stdin

Allow passing old index as positional argument.
Use more streaming for index merging
Use stdin for new index rather than old one
Remove stray ls in .build.yml
Automatically upload new version to repo

Using itself in the process... :)
First shot at CI build