add usage info

4ca17c55 · test_nonet · 224569c5 · 4ca17c55
Commit 4ca17c55 authored 4 years ago by test_nonet
--- a/release.nix
+++ b/release.nix
+# usage:
+#   nix-build release.nix -A espressif-esp32-tools
+#   nix-build release.nix -A espressif-esp32-tools --arg crossAarch64 true
+#   mkdir tmp; cd tmp; nix-shell ../release.nix -A espressif-esp32-tools --arg crossAarch64 true
 let
  nixpkgs = import <nixpkgs>;
  overlay = import ./overlay.nix;