Squashed commit of the following: (#98)

commit 30859a52b9cc325c323b414133856d0af3ffc2a6
Author: scossu <stefano@cossu.cc>
Date:   Wed Feb 28 22:17:36 2024 -0500

    Move ext checkout to github actions.

commit 6d8da6df68ac764f90deb15861089095043fd4ba
Author: scossu <stefano@cossu.cc>
Date:   Wed Feb 28 21:45:01 2024 -0500

    Use git clone instead of submodule.

commit ade9da589179870d331b703ff526d7fff33e88bb
Author: scossu <stefano@cossu.cc>
Date:   Wed Feb 28 21:42:45 2024 -0500

    Manually add yiddish submodules.

commit 77cb9ef2959f611d0220cc405e0b584ece71147c
Author: scossu <stefano@cossu.cc>
Date:   Wed Feb 28 21:23:37 2024 -0500

    Do not remove yiddish module.

commit e405b3605dd2629ed5557ccc5fdd5fe8812799ed
Author: scossu <stefano@cossu.cc>
Date:   Wed Feb 28 09:11:41 2024 -0500

    Fix WORKDIR in Dockerfile

commit 95445ba642163e28b94df6736ad6946ad7dc76c0
Author: scossu <stefano@cossu.cc>
Date:   Wed Feb 28 09:07:50 2024 -0500

    Change refs for Yiddish submodules.

commit 208ea095e792195981f644497ccd5fcd55e15c1b
Author: scossu <stefano@cossu.cc>
Date:   Wed Feb 28 08:45:58 2024 -0500

    Update checkout workflow.