feat: run actionlint on GitHub Actions workflows

Starting to lint GitHub Actions workflows with actionlint.

Author: jfroche

nix/hooks.nix

@@ -1,4 +1,8 @@
 { inputs, ... }:
+let
+  ghWorkflows = builtins.attrNames (builtins.readDir ../.github/workflows);
+  lintedWorkflows = [ "qemu-image-build.yml" ];
+in
 {
   imports = [ inputs.git-hooks.flakeModule ];
   perSystem =
@@ -8,9 +12,17 @@
         check.enable = true;
         settings = {
           hooks = {
+            actionlint = {
+              enable = true;
+              excludes = builtins.filter (name: !builtins.elem name lintedWorkflows) ghWorkflows;
+              verbose = true;
+            };
+
             treefmt = {
               enable = true;
               package = config.treefmt.build.wrapper;
+              pass_filenames = false;
+              verbose = true;
             };
           };
         };