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>

Cargo.toml

@@ -0,0 +1,31 @@
+[package]
+name = "krust"
+version = "0.1.0"
+edition = "2021"
+authors = ["Jason Hall <imjasonh@gmail.com>"]
+description = "A container image build tool for Rust applications"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/imjasonh/krust"
+keywords = ["container", "docker", "oci", "build", "rust"]
+categories = ["command-line-utilities", "development-tools"]
+
+[dependencies]
+clap = { version = "4.5", features = ["derive", "env"] }
+tokio = { version = "1.35", features = ["full"] }
+anyhow = "1.0"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+sha256 = "1.5"
+chrono = "0.4"
+tar = "0.4"
+flate2 = "1.0"
+oci-distribution = "0.11"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+dirs = "5.0"
+toml = "0.8"
+
+[dev-dependencies]
+tempfile = "3.9"
+assert_cmd = "2.0"
+predicates = "3.0"