Initial commit: krust - container image build tool for Rust

krust builds container images for Rust applications without Docker:
- Builds static binaries using musl libc
- Creates minimal OCI container images
- Pushes to any OCI-compliant registry
- Outputs digest to stdout for composability

Inspired by ko.build for Go applications.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

example/hello-krust/.cargo/config.toml

@@ -0,0 +1,8 @@
+[target.x86_64-unknown-linux-musl]
+linker = "x86_64-linux-musl-gcc"
+
+[target.aarch64-unknown-linux-musl]
+linker = "aarch64-linux-musl-gcc"
+
+[target.armv7-unknown-linux-musleabihf]
+linker = "armv7-linux-musleabihf-gcc"

example/hello-krust/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "hello-krust"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

example/hello-krust/src/main.rs

@@ -0,0 +1,4 @@
+fn main() {
+    println!("Hello from krust example!");
+    println!("This is running inside a container built with krust.");
+}