Gate Windows ARM64 packaging explicitly

scripts/package-release.sh

@@ -62,6 +62,24 @@ else
   release_dir="target/release"
 fi
 
+need_target_linker() {
+  case "${target:-}" in
+    x86_64-pc-windows-gnu)
+      if ! command -v x86_64-w64-mingw32-gcc >/dev/null 2>&1 \
+        && ! command -v x86_64-w64-mingw32-clang >/dev/null 2>&1; then
+        echo "windows/x86_64 packaging requires x86_64-w64-mingw32-gcc or x86_64-w64-mingw32-clang" >&2
+        exit 1
+      fi
+      ;;
+    aarch64-pc-windows-gnullvm)
+      if ! command -v aarch64-w64-mingw32-clang >/dev/null 2>&1; then
+        echo "windows/aarch64 packaging requires aarch64-w64-mingw32-clang" >&2
+        exit 1
+      fi
+      ;;
+  esac
+}
+
 if command -v git >/dev/null 2>&1 && git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
   if [ -z "${DOSH_BUILD_GIT_HASH:-}" ]; then
     export DOSH_BUILD_GIT_HASH="$(git rev-parse --short=12 HEAD)"
@@ -78,6 +96,8 @@ if command -v git >/dev/null 2>&1 && git rev-parse --is-inside-work-tree >/dev/n
   fi
 fi
 
+need_target_linker
+
 if [ "$os" = "windows" ]; then
   if [ -n "$target" ]; then
     cargo build --release --target "$target" --bin dosh-client --bin dosh-bench