dist: destroy workdir on exist

This no longer relies on the hermetic build system to clean up.

Signed-off-by: Ophestra <cat@gensokyo.uk>

dist/release.sh

@@ -5,6 +5,11 @@ prefix="${PREFIX:-/usr}"
 pname="hakurei-${VERSION}-$(go env GOARCH)"
 out="${DESTDIR:-dist}/${pname}"
 
+destroy_workdir() {
+  rm -rf "${out}"
+}
+trap destroy_workdir EXIT
+
 echo '# Preparing distribution files.'
 mkdir -p "${out}"
 cp -v "README.md" "dist/hsurc.default" "dist/install.sh" "${out}"