chore(module): slim down pipeline yaml generation even more

lib/flakeModule.nix

@@ -164,12 +164,7 @@
         # NOTE: json is also valid yaml and this removes dependency on jq
         #  and/or remarshal (used in pkgs.formats.json and pkgs.formats.yaml
         #  respectively)
-        toYaml = name: value:
-          pkgs.runCommand name {} ''
-            cat <<'EOT' > $out
-            ${builtins.toJSON value}
-            EOT
-          '';
+        toYaml = name: value: builtins.toFile name (builtins.toJSON value);
         mapAttrs = cb: set: builtins.listToAttrs (builtins.map (key: cb key (builtins.getAttr key set)) (builtins.attrNames set));
         prepend = key: arr: job:
           job