Add musl.cc cross-compiler toolchains

Author: kyle-github

.gitattributes

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+# Git LFS configuration for large binary files
+# Cross-compiler toolchains (stored with Git LFS)
+cross-compilers/*.tgz filter=lfs diff=lfs merge=lfs -text

cross-compilers/.gitkeep

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+# Cross-Compiler Toolchains
+
+This directory contains pre-built cross-compiler toolchains from [musl.cc](https://musl.cc/).
+
+## Files
+
+These files are stored with Git LFS (Large File Storage) and are downloaded via GitHub Actions CI/CD:
+
+- `arm-linux-musleabihf-cross.tgz` - ARM 32-bit (ARMv7) EABI Hard Float
+- `riscv64-linux-musl-cross.tgz` - RISC-V 64-bit
+- `s390x-linux-musl-cross.tgz` - IBM System z (s390x)
+- `powerpc64le-linux-musl-cross.tgz` - PowerPC 64-bit Little Endian
+
+## Downloading Toolchains Locally
+
+To download these toolchains to your local machine:
+
+1. **Install Git LFS** (if not already installed):
+   ```bash
+   # macOS
+   brew install git-lfs
+
+   # Ubuntu/Debian
+   sudo apt-get install git-lfs
+
+   # Other systems: https://git-lfs.com/
+   ```
+
+2. **Initialize Git LFS in this repository** (one-time setup):
+   ```bash
+   git lfs install
+   ```
+
+3. **Run the download script**:
+   ```bash
+   ./scripts/download-musl-cc.sh
+   ```
+
+   This script will:
+   - Create this directory if it doesn't exist
+   - Download all four cross-compiler toolchains
+   - Retry up to 3 times if downloads fail
+   - Store them for Git LFS tracking
+
+4. **Commit and push to GitHub**:
+   ```bash
+   git add cross-compilers/ .gitattributes
+   git commit -m "Add musl.cc cross-compiler toolchains"
+   git push
+   ```
+
+## Git LFS Tracking
+
+These files are tracked with Git LFS, which means:
+
+- Git stores pointers to the actual files instead of the full archives
+- The repository size remains small
+- When you clone or pull, Git LFS downloads only the files you need
+- Bandwidth usage is optimized for large binary files
+
+To verify Git LFS is working correctly, check the `.gitattributes` file to see which patterns are tracked.
+
+## Why These Toolchains?
+
+The musl.cc project provides pre-built, statically-linked cross-compiler toolchains. They're:
+- Ready to use without system dependencies
+- Statically compiled (portable across Linux distributions)
+- Designed for cross-compilation to various architectures
+- Updated regularly with latest compiler versions
+
+## Updates
+
+To update these toolchains to newer versions in the future:
+
+1. Run the download script again: `./scripts/download-musl-cc.sh`
+2. Git will detect changes if new versions are available
+3. Commit and push the updated files
+
+## References
+
+- [musl.cc](https://musl.cc/) - Pre-built musl libc cross-compiler toolchains
+- [Git LFS Documentation](https://git-lfs.com/)

cross-compilers/README.md

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cross-compilers/arm-linux-musleabihf-cross.tgz

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cross-compilers/powerpc64le-linux-musl-cross.tgz

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cross-compilers/riscv64-linux-musl-cross.tgz

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