feat: enable draft-pqc feature on pgp crate

This is needed to have support of v6 PQC keys
by the time users start generating profiles
using such keys.

Test key was generated with rsop/v0.10.0-16-gd98265f
(commit d98265f821e7bb181d06da1d634c5c4668d89e83)
using the command
cargo run --features draft-pqc generate-key \
          --profile draft-ietf-openpgp-pqc-14-v6-ed25519-mlkem768x25519

src/pgp.rs

@@ -847,4 +847,41 @@ mod tests {
         assert!(merge_openpgp_certificates(alice.clone(), bob.clone()).is_err());
         assert!(merge_openpgp_certificates(bob.clone(), alice.clone()).is_err());
     }
+
+    /// Test PQC support.
+    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+    async fn test_pqc() -> Result<()> {
+        let mut tcm = TestContextManager::new();
+        let alice = &tcm.alice().await;
+        let pqc = &tcm.pqc().await;
+
+        let pqc_received_message = tcm.send_recv_accept(alice, pqc, "Hi!").await;
+        let pqc_chat_id = pqc_received_message.chat_id;
+        let pqc_sent = pqc.send_text(pqc_chat_id, "Hello back!").await;
+
+        let alice_rcvd = alice.recv_msg(&pqc_sent).await;
+        assert_eq!(alice_rcvd.text, "Hello back!");
+
+        Ok(())
+    }
+
+    /// Tests securejoin with inviter using PQC key.
+    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+    async fn test_securejoin_pqc_inviter() {
+        let mut tcm = TestContextManager::new();
+        let alice = &tcm.alice().await;
+        let pqc = &tcm.pqc().await;
+
+        tcm.execute_securejoin(pqc, alice).await;
+    }
+
+    /// Tests securejoin with joiner using PQC key.
+    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+    async fn test_securejoin_pqc_joiner() {
+        let mut tcm = TestContextManager::new();
+        let pqc = &tcm.pqc().await;
+        let bob = &tcm.bob().await;
+
+        tcm.execute_securejoin(bob, pqc).await;
+    }
 }