keyring: add Aleksa's <cyphar@cyphar.com> signing key

keyid C9C370B246B09F6DBCFC744C34401015D1D2D386

This is my personal signing key, which I've used to sign the vast
majority of my commits on GitHub. While I usually sign releases using my
<asarai@suse.de> signing key, it doesn't hurt to include this key too.

Ref: https://keyserver.ubuntu.com/pks/lookup?search=C9C370B246B09F6DBCFC744C34401015D1D2D386&fingerprint=on&op=index
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>

runc.keyring

@@ -69,3 +69,56 @@ KWr9ByCKAwVHsaSgVSJE/dse4f1toqeEHHbWk682U4RqOWZR4bA0
 =3/jE
 -----END PGP PUBLIC KEY BLOCK-----
 
+pub   ed25519 2019-06-21 [C]
+      C9C370B246B09F6DBCFC744C34401015D1D2D386
+uid           [ultimate] Aleksa Sarai <cyphar@cyphar.com>
+sub   ed25519 2022-09-30 [S] [expires: 2024-09-29]
+sub   cv25519 2022-09-30 [E] [expires: 2024-09-29]
+sub   ed25519 2022-09-30 [A] [expires: 2024-09-29]
+
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Comment: github=cyphar
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+-----END PGP PUBLIC KEY BLOCK-----
+