Fix ARM64 runner

[PastelStorm]

Note

Medium Risk
Changes the CD build/publish pipeline for arm64 and multi-arch manifests; mistakes could break image publication or tagging, though no runtime app logic changes are involved.

Overview
Adds manual triggering (workflow_dispatch) to the Docker publish workflow and switches the arm64 build job to run on GitHub-hosted ubuntu-24.04-arm instead of the custom ARM runner.

Simplifies multi-arch image publishing by replacing multiple docker manifest create/push steps with a single docker buildx imagetools create that tags latest, $SHORT_SHA, and the package VERSION. Docker smoke tests now always set SKIP_INFERENCE_TESTS=true for both architectures.

Bumps the package version to 0.1.1 and documents these release notes in CHANGELOG.md.

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