fix: resolve aarch64-unknown-linux-musl build issue with cargo-zigbuild integration (#201)

- Enable install-cross-tools in GitHub Actions build workflow
- Add cargo-zigbuild support for Linux targets in build-rustfs.sh
- Prioritize cargo-zigbuild over cross tool for better glibc compatibility
- Add musl-specific environment variables for proper static linking
- Update error messages with Linux-specific build suggestions
- Configure Zig compiler environment for musl targets

.github/workflows/build.yml

@@ -185,6 +185,7 @@ jobs:
           cache-shared-key: build-${{ matrix.target }}-${{ hashFiles('**/Cargo.lock') }}
           github-token: ${{ secrets.GITHUB_TOKEN }}
           cache-save-if: ${{ github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/') }}
+          install-cross-tools: true
 
       - name: Build RustFS using build-rustfs.sh
         run: |