Add build-debug script

build-debug.sh

@@ -0,0 +1,12 @@
+#! /bin/sh
+
+set -euo pipefail
+set -x
+
+# Note: cargo-wasix automatically runs wasm-opt with -O2, which makes the resulting binary unusable.
+# Instead, we use the toolchain to build (cargo +wasix instead of cargo wasix) and optimize manually.
+cargo +wasix build --target wasm32-wasmer-wasi
+mv target/wasm32-wasmer-wasi/debug/winterjs.wasm x.wasm
+wasm-opt x.wasm -o target/wasm32-wasmer-wasi/debug/winterjs.wasm -O1 --enable-bulk-memory --enable-threads --enable-reference-types --no-validation --asyncify
+rm x.wasm
+wasm-strip target/wasm32-wasmer-wasi/debug/winterjs.wasm