fix(nix-kubernetes): remove shebang from git_clone script and hide pushd/popd output

nix-kubernetes/coder.nix

@@ -24,16 +24,13 @@
         repo = ''''${data.coder_parameter.git_repo.value}'';
         repo_folder = ''''${local.git_repo_folder}'';
       in ''
-        #!/usr/bin/env bash
-        set -eux
-
         echo "Cloning repo \"${repo}\" if it does not exist"
         mkdir -p ~/repos
-        pushd ~/repos
+        pushd ~/repos >/dev/null
           if [[ ! -z "${repo}" && ! -d "${repo_folder}" ]] then
             git clone ${repo} ${repo_folder}
           fi
-        popd
+        popd >/dev/null
       '';
       run_on_start = true;
       start_blocks_login = true;