feat(flake): add shellcheck to pre-commit-check

flake.nix

@@ -176,7 +176,10 @@
         pkgs = nixpkgs.legacyPackages.${system};
         pre-commit-check = pre-commit-hooks.lib.${system}.run {
           src = ./.;
-          hooks = { nixfmt.enable = true; };
+          hooks = {
+            nixfmt.enable = true;
+            shellcheck.enable = true;
+          };
         };
       in {
         formatter = nixpkgs.legacyPackages."${system}".nixfmt;

scripts/create-gpg-key

@@ -1,5 +1,6 @@
 #! /usr/bin/env nix-shell
 #! nix-shell -i bash -p bash gnupg
+# shellcheck shell=bash
 
 set -euo pipefail
 

scripts/setup-partitions

@@ -1,5 +1,6 @@
 #! /usr/bin/env nix-shell
 #! nix-shell -i bash -p bash parted cryptsetup btrfs-progs
+# shellcheck shell=bash
 
 set -euo pipefail