feat: Add CI/CD workflows for testing and publishing SAL crates

- Add a workflow for testing the publishing setup
- Add a workflow for publishing SAL crates to crates.io
- Improve crate metadata and version management
- Add optional dependencies for modularity
- Improve documentation for publishing and usage

virt/README.md

@@ -1,7 +1,16 @@
-# SAL Virt Package
+# SAL Virt Package (`sal-virt`)
 
 The `sal-virt` package provides comprehensive virtualization and containerization tools for building, managing, and deploying containers and filesystem layers.
 
+## Installation
+
+Add this to your `Cargo.toml`:
+
+```toml
+[dependencies]
+sal-virt = "0.1.0"
+```
+
 ## Features
 
 - **Buildah**: OCI/Docker image building with builder pattern API