Improve release and benchmark tooling

scripts/package-release.sh

@@ -12,6 +12,7 @@ normalize_os() {
     Darwin) printf '%s\n' macos ;;
     Linux) printf '%s\n' linux ;;
     FreeBSD) printf '%s\n' freebsd ;;
+    MINGW*|MSYS*|CYGWIN*) printf '%s\n' windows ;;
     *) uname -s | tr '[:upper:]' '[:lower:]' ;;
   esac
 }
@@ -27,8 +28,13 @@ normalize_arch() {
 
 os="$(normalize_os)"
 arch="$(normalize_arch)"
-artifact="dosh-$os-$arch.tar.gz"
-versioned_artifact="dosh-$version-$os-$arch.tar.gz"
+if [ "$os" = "windows" ]; then
+  artifact="dosh-$os-$arch.zip"
+  versioned_artifact="dosh-$version-$os-$arch.zip"
+else
+  artifact="dosh-$os-$arch.tar.gz"
+  versioned_artifact="dosh-$version-$os-$arch.tar.gz"
+fi
 stage="$out_dir/stage/dosh"
 
 cargo build --release
@@ -42,11 +48,38 @@ for bin in dosh-client dosh-server dosh-auth dosh-bench; do
 done
 printf '%s\n' "$version" >"$stage/VERSION"
 
-tar -C "$out_dir/stage" -czf "$out_dir/$artifact" dosh
+if [ "$os" = "windows" ]; then
+  if command -v powershell.exe >/dev/null 2>&1; then
+    powershell.exe -NoProfile -Command "Compress-Archive -Force -Path '$stage' -DestinationPath '$out_dir/$artifact'"
+  elif command -v zip >/dev/null 2>&1; then
+    (cd "$out_dir/stage" && zip -qr "../$artifact" dosh)
+  else
+    echo "windows packaging requires powershell.exe or zip" >&2
+    exit 1
+  fi
+else
+  tar -C "$out_dir/stage" -czf "$out_dir/$artifact" dosh
+fi
 cp "$out_dir/$artifact" "$out_dir/$versioned_artifact"
 
+write_sha256() {
+  file="$1"
+  if command -v sha256sum >/dev/null 2>&1; then
+    sha256sum "$file" >"$file.sha256"
+  elif command -v shasum >/dev/null 2>&1; then
+    shasum -a 256 "$file" >"$file.sha256"
+  else
+    echo "warning: sha256sum/shasum not found; skipping checksum for $file" >&2
+  fi
+}
+
+write_sha256 "$out_dir/$artifact"
+write_sha256 "$out_dir/$versioned_artifact"
+
 cat <<EOF
 Wrote:
   $out_dir/$artifact
+  $out_dir/$artifact.sha256
   $out_dir/$versioned_artifact
+  $out_dir/$versioned_artifact.sha256
 EOF