Fix ARM64 image issues (#4233)
<!-- CURSOR_SUMMARY -->
> [!NOTE]
> **Medium Risk**
> Touches release CD for multi-arch Docker publishing and alters Docker
build dependency installation behavior; failures could block image
releases or mask install issues despite limited runtime code impact.
>
> **Overview**
> Improves the Docker publish GitHub Actions workflow by adding a manual
`workflow_dispatch` trigger, switching to native runners for both
`amd64` and `arm64`, and setting `fail-fast: false` so one-arch
flakiness doesn’t cancel the other.
>
> Reduces CD image testing to a consistent lightweight target
(`test_unstructured/partition/test_text.py` plus smoke tests) and
hardens Docker builds by adding 3-attempt retry logic around `apk
update/add` to mitigate transient Chainguard mirror failures. Bumps
version to `0.19.3` and updates the changelog accordingly.
>
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
559244ddc4603fcb362ebf9ab3e2f152c1db3076. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
