* test AUv2 with debug build
* updated AU to v4 for build pipeline; test 1
* upgraded checkout from v2 to v4; test 1
* migrating from actions-rs to dtolnay stuff; test 1
* migrating from actions-rs to dtolnay stuff; test 2
* migrating from actions-rs to dtolnay stuff; test 3
* migrating from actions-rs to dtolnay stuff; matrix build; test 1
* migrating from actions-rs to dtolnay stuff; matrix build; test 2
* migrating from actions-rs to dtolnay stuff; matrix build; test 3
* migrating from actions-rs to dtolnay stuff; matrix build; test 4
* migrating from actions-rs to dtolnay stuff; matrix build; test 5
* migrating from actions-rs to dtolnay stuff; matrix build; test 6
* migrating from actions-rs to dtolnay stuff; matrix build; test 7
* updated ci pipeline
* updated ci pipeline; test 2
* remove cruft
* updated ci pipeline; test 3
* updated ci pipeline; test 4
* updated the rest
* updated the rest; test 2
* updated codecov action