.github/workflows: Migrate workflows to Blacksmith runners

[blacksmith-sh]

This PR has been automatically generated by a team member in your GitHub organization using Blacksmith's Migration Wizard. This PR changes the following:

1. Your selected workflows will now run on Blacksmith's 2x faster hardware (e.g., runs-on: blacksmith-4vcpu-ubuntu-2204). Learn more about the different instances available to choose from.
2. Your jobs running on Blacksmith will now have all official GitHub and popular third-party cache actions automatically interact with our 4x faster, colocated cache. Learn more about Blacksmith's actions cache.
3. Your GitHub Actions will now actually be observable. Learn more about Blacksmith's logging and other observability features.
4. Your Docker builds will now automatically share their Docker layer cache, resulting in up to 40x faster builds. Learn more about Blacksmith's Docker layer caching.

Summary by Sourcery

CI:

• Update all release, CI, and sync workflows to run on blacksmith-4vcpu-ubuntu-2404 runners instead of self-hosted infrastructure.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

.github workflows are migrated from self-hosted runners to Blacksmith-managed runners by updating the runs-on configuration across several release and CI workflows.

File-Level Changes

Change	Details	Files
Migrate release workflow jobs from self-hosted runners to Blacksmith runners.	Update runs-on value for the build job to use blacksmith-4vcpu-ubuntu-2404. Update runs-on value for the cross-compile job to use blacksmith-4vcpu-ubuntu-2404. Update runs-on value for the pkgbuild job to use blacksmith-4vcpu-ubuntu-2404. Update runs-on value for the deb packaging job to use blacksmith-4vcpu-ubuntu-2404. Update runs-on value for the release publishing job to use blacksmith-4vcpu-ubuntu-2404.	.github/workflows/release.yml
Migrate release-plz workflow jobs from self-hosted runners to Blacksmith runners.	Update runs-on value for the release-plz-release job to use blacksmith-4vcpu-ubuntu-2404. Update runs-on value for the release-plz-pr job to use blacksmith-4vcpu-ubuntu-2404.	.github/workflows/release-plz.yml
Migrate CI workflow test job from self-hosted runners to Blacksmith runners.	Update runs-on value for the Arch Linux test job to use blacksmith-4vcpu-ubuntu-2404.	.github/workflows/ci.yml
Migrate sync-pkgbuild workflow job from self-hosted runners to Blacksmith runners.	Update runs-on value for the sync job to use blacksmith-4vcpu-ubuntu-2404.	.github/workflows/sync-pkgbuild.yml

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[sourcery-ai]

Hey - I've left some high level feedback:

• Since these jobs previously ran on self-hosted runners, double-check whether any implicit host-level dependencies (custom tools, mounted volumes, preinstalled SDKs, or environment variables) were provided by your self-hosted machines; if so, they should either be moved into the container images or explicitly recreated on the Blacksmith runner.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Since these jobs previously ran on self-hosted runners, double-check whether any implicit host-level dependencies (custom tools, mounted volumes, preinstalled SDKs, or environment variables) were provided by your self-hosted machines; if so, they should either be moved into the container images or explicitly recreated on the Blacksmith runner.

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