Support OpenBLAS by default

[zhenghaoz]

No description provided.

[Copilot]

Pull Request Overview

This PR adds OpenBLAS support as a default BLAS implementation for the Gorse project, providing an alternative to Intel MKL. The changes enable OpenBLAS integration across multiple architectures (amd64, arm64, riscv64) through both Go code modifications and Docker infrastructure.

• Integrates OpenBLAS as a new BLAS backend with conditional compilation via build tags
• Creates Docker build infrastructure for OpenBLAS across all Gorse components and architectures
• Updates build cache configuration from GitHub Actions to Cloudflare R2 storage

Reviewed Changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
docker-bake.hcl	Renames target from "image" to "openblas" and updates cache configuration to use Cloudflare R2
common/floats/mm_openblas.go	New OpenBLAS-specific matrix multiplication implementation with cgo integration
common/floats/mm.go	Updates build constraints to exclude OpenBLAS builds
common/floats/floats_*.go	Adds OPENBLAS feature flag and integrates it into architecture-specific optimization logic
common/blas/blas_openblas.go	New BLAS wrapper for OpenBLAS SGEMM operations
cmd/*/Dockerfile.openblas	New Dockerfiles for building each component with OpenBLAS support
cmd/*/Dockerfile.mkl	Simplifies MKL Dockerfiles by using golang base image directly

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