Squashed commit of the following: (#98)

commit 30859a5
Author: scossu <[email protected]>
Date:   Wed Feb 28 22:17:36 2024 -0500

    Move ext checkout to github actions.

commit 6d8da6d
Author: scossu <[email protected]>
Date:   Wed Feb 28 21:45:01 2024 -0500

    Use git clone instead of submodule.

commit ade9da5
Author: scossu <[email protected]>
Date:   Wed Feb 28 21:42:45 2024 -0500

    Manually add yiddish submodules.

commit 77cb9ef
Author: scossu <[email protected]>
Date:   Wed Feb 28 21:23:37 2024 -0500

    Do not remove yiddish module.

commit e405b36
Author: scossu <[email protected]>
Date:   Wed Feb 28 09:11:41 2024 -0500

    Fix WORKDIR in Dockerfile

commit 95445ba
Author: scossu <[email protected]>
Date:   Wed Feb 28 09:07:50 2024 -0500

    Change refs for Yiddish submodules.

commit 208ea09
Author: scossu <[email protected]>
Date:   Wed Feb 28 08:45:58 2024 -0500

    Update checkout workflow.