microdroid_manager: verify APK/APEXes

Even though libapkverify doesn't do much verification for now, having
it in use would make CI detect errors in the future.

TODO:
- zipfuse should wait until APK is verified.
- boot should abort when verification fails.

Bug: 190343842
Test: MicrodroidHostTestCases
Change-Id: I221be1c7d9a0bfcd312593d3958f950311b67af5
diff --git a/apkverify/src/v3.rs b/apkverify/src/v3.rs
index 0a292df..1bf8a61 100644
--- a/apkverify/src/v3.rs
+++ b/apkverify/src/v3.rs
@@ -16,6 +16,9 @@
 
 //! Verifies APK Signature Scheme V3
 
+// TODO(jooyung) remove this
+#![allow(dead_code)]
+
 use anyhow::{anyhow, bail, Result};
 use bytes::Bytes;
 use std::fs::File;