perf: parallelize Docker multi-arch builds using native runners #118
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Split the single Docker build job into parallel architecture-specific jobs to eliminate QEMU emulation bottleneck. The AMD64 build runs on standard Ubuntu runners while ARM64 builds use native ARM runners, which should reduce total build time considerably. Added corresponding Makefile targets for building individual architectures and creating multi-arch manifests, allowing the workflow to build both architectures simultaneously before combining them into a single manifest.
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This PR splits the single Docker build job into parallel architecture-specific jobs to eliminate QEMU emulation bottleneck.
The AMD64 build runs on standard Ubuntu runners while ARM64 builds use native ARM runners, which should reduce total build time considerably.
I added corresponding Makefile targets for building individual architectures and creating multi-arch manifests, allowing the workflow to build both architectures simultaneously before combining them into a single manifest.