[Nix] Add localstack-down
Summary:
Allow for localstack to be easily be shutdown through nix
part of: https://linear.app/comm/issue/ENG-1697
Depends on D5245
Test Plan:
nix run .#localstack-up # get message about it being up docker ps # assert localstack is running nix run .#localstack-down docker ps # assert localstack is no longer running
Reviewers: atul, abosh, varun, O1 Nix, ashoat
Reviewed By: varun, O1 Nix, ashoat
Subscribers: ashoat, tomek
Differential Revision: https://phab.comm.dev/D5246