Cargo: Add cargo release settings

Author: woodruffw

Cargo.toml

@@ -9,6 +9,10 @@ repository = "https://github.com/woodruffw/steg86"
 keywords = ["cli", "steganography", "steg", "x86"]
 categories = ["command-line-utilities", "encoding"]
 
+[package.metadata.release]
+no-dev-version = true
+disable-publish = true # handled by GitHub Actions
+
 [dependencies]
 anyhow = "1.0"
 bit-vec = "0.6.2"