perf(build): use native ARM64 runner for standard Linux ARM64 builds

Extend native ARM64 runner usage to standard Linux ARM64 builds
(not just Alpine). This provides consistent performance benefits
across all Linux ARM64 builds.

Author: jdalton

.github/workflows/build-smol.yml

@@ -129,7 +129,7 @@ jobs:
             os: linux
             platform: linux
             arch: x64
-          - runner: ubuntu-latest
+          - runner: ubuntu-24.04-arm64
             os: linux
             platform: linux
             arch: arm64