Change Details

- Install nix and flakes (out of scope for this PR, part of D2921) - Run `nix develop` - Do normal workflow

- Install nix and flakes (out of scope for this PR, part of D2921) - Run `nix develop` - Do workflows which require `yarn`

- Install nix and flakes (out of scope for this PR, part of D2921) - Run `nix develop` - Do normal workflowworkflows which require `yarn`