revert vars: use writeShellApplication to shellcheck generators
Cannot re-generate the vars for data-mesher or any of our tests anymore
cc @DavHau @Qubasa Can we work together to fix this.
I like shellchecking but if we loose the ability to add tests thats unfortunate
This is blocking: the new 'restic' and 'zerotier' migrations because we need to write integration tests from the beginning.
c895907b9d