Add test files

sig/Cargo.toml

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+[package]
+name = "sig"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

sig/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}

sig/test/ota-package-list.json

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+{"packages": [{"file": "cc2_eeb001_01.03.02.36_20260326171745.swu.sig", "hash": "46aa459b61340a84ff52e2865347d42a568351919441fb9db6e185424220b192"}], "version": "01.03.02.36"}