Add --release test

[smoelius]

No description provided.

[smoelius]

The tests are failing because tests that should lock these mutexes are not:

test-fuzz/cargo-test-fuzz/tests/integration/main.rs

Lines 14 to 15 in a77b2b7

	static ASSERT_MUTEX: Mutex<()> = Mutex::new(());
	static PARSE_DURATION_MUTEX: Mutex<()> = Mutex::new(());

This use of mutexes is flawed and should be replaced.

We should instead have conflicting tests use their own "out" directories.