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feat: Add multi-arch support

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- Support building for multiple platforms with --platform flag
- Accept comma-separated platforms or multiple --platform flags
- Default to building for linux/amd64 and linux/arm64
- Add ARM runner (ubuntu-24.04-arm) to CI matrix
- Create manifest list for multi-arch images (TODO: push to registry)
- Update integration tests to handle multi-platform builds
- Add cross-compilation setup instructions to README
- Add .cargo/config.toml for local development

Breaking changes:
- Default behavior now builds for multiple platforms (amd64+arm64)
- Use --platform linux/amd64 to build for single platform
This commit is contained in:
Jason Hall 2025-06-07 22:28:15 -04:00
parent 11083dc527
commit 6153452303
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8 changed files with 260 additions and 37 deletions
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README.md
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@ -100,8 +100,14 @@ krust build example/hello-krust --no-push
# Use a specific image name (overrides KRUST_REPO)
krust build --image myregistry.io/myapp:v1.0
# Build for a different platform
# Build for a specific platform
krust build --platform linux/arm64
# Build for multiple platforms (multi-arch)
krust build --platform linux/amd64,linux/arm64
# Or specify platforms separately
krust build --platform linux/amd64 --platform linux/arm64
```
### Build with custom cargo arguments
@ -185,6 +191,7 @@ When determining the base image, krust uses this precedence order:
- **Docker-free** - Builds OCI container images without requiring Docker daemon
- **Static binaries** - Produces truly static binaries using musl libc
- **Composable** - Outputs image digest to stdout, enabling `docker run $(krust build)`
- **Multi-arch support** - Build for multiple platforms in a single command
- **Cross-platform** - Supports multiple architectures (amd64, arm64, arm/v7)
- **Minimal images** - Uses distroless base images for security and size
- **OCI compliant** - Works with any OCI-compliant container registry
@ -260,6 +267,15 @@ This is normal when building linux/amd64 images on Apple Silicon. The images wil
git clone https://github.com/imjasonh/krust.git
cd krust
# Install cross-compilation toolchain (required for tests)
# On macOS:
brew install messense/macos-cross-toolchains/x86_64-unknown-linux-musl
brew install messense/macos-cross-toolchains/aarch64-unknown-linux-musl
# Install Rust targets
rustup target add x86_64-unknown-linux-musl
rustup target add aarch64-unknown-linux-musl # Optional, for ARM64 support
# Install pre-commit hooks
pip install pre-commit
or