CI: Add Debian package generation

Cargo.toml

@@ -10,6 +10,17 @@ categories = ["command-line-utilities", "cryptography"]
 license = "MIT OR Apache-2.0"
 edition = "2018"
 
+[package.metadata.deb]
+extended-description = """\
+An age plugin adding support for YubiKeys and other PIV hardware tokens. \
+Currently in BETA; we strongly recommend using this with a new YubiKey."""
+section = "utils"
+assets = [
+    ["target/release/age-plugin-yubikey", "usr/bin/", "755"],
+    ["target/manpages/age-plugin-yubikey.1.gz", "usr/share/man/man1/", "644"],
+    ["README.md", "usr/share/doc/age-plugin-yubikey/README.md", "644"],
+]
+
 [dependencies]
 age-core = "0.5"
 age-plugin = "0.0"