use arm64 GitHub Actions runners for arm64 docker image builds #67
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GitHub just announced the availability of Linux arm64 runners for public repositories: https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/
This change updates the CI workflow to use the arm64 runners for building the arm64 Docker images, resulting in build times on par with (or a bit faster than) the amd64 Linux build. As of when I created this PR, the "Before" run is still going and I'm estimating will take 4+ hours to finish.
Before Run: https://github.com/nightlark/holy-build-box/actions/runs/12818429695/job/35743918705
After Run: https://github.com/nightlark/holy-build-box/actions/runs/12819551315/job/35747418552