perf: skip substituter checks for trivial workflow builders

Use runCommandLocal instead of runCommand for the YAML generation
and workflow directory derivations, avoiding slow binary cache
lookups for builds that complete instantly locally.

Author: typedrat

modules/github-ci.nix

@@ -84,7 +84,7 @@ in {
           lib.mapAttrs' (
             name: workflow:
               lib.nameValuePair "${name}.yml" (
-                pkgs.runCommand "${name}.yml" {
+                pkgs.runCommandLocal "${name}.yml" {
                   nativeBuildInputs = [pkgs.yq-go];
                   json = builtins.toJSON (workflowToYaml workflow);
                   passAsFile = ["json"];
@@ -103,7 +103,7 @@ in {
 
         githubActions.workflowsDir = lib.mkIf cfg.enable (
           # Create a directory with all workflow files
-          pkgs.runCommand "github-workflows" {} ''
+          pkgs.runCommandLocal "github-workflows" {} ''
             mkdir -p $out
             ${lib.concatStringsSep "\n" (lib.mapAttrsToList (name: file: ''
                 cp ${file} $out/${name}