Implement embedded OpenPGP compatibility (#4)

crates/storage/Cargo.toml

@@ -10,6 +10,8 @@ publish = false
 cap-std.workspace = true
 cap-tempfile.workspace = true
 clap.workspace = true
+pgp.workspace = true
+rand.workspace = true
 serde.workspace = true
 shlex.workspace = true
 toml.workspace = true
@@ -19,7 +21,6 @@ zeroize.workspace = true
 [dev-dependencies]
 flate2 = "1.1"
 hex = "0.4"
-pgp = { version = "0.20", default-features = false }
 rand_chacha = "0.3"
 rustix = { version = "1.1", features = ["fs"] }
 sha1 = "0.10"