Check if local go is already installed

kobopatch-wasm/setup.sh

@@ -6,6 +6,14 @@ KOBOPATCH_DIR="$SCRIPT_DIR/kobopatch-src"
 GO_VERSION="1.23.12"
 LOCAL_GO_DIR="$SCRIPT_DIR/go"
 
+# Use system Go if available, otherwise download locally
+if command -v go &>/dev/null; then
+    echo "Using system Go: $(go version)"
+elif [ -x "$LOCAL_GO_DIR/bin/go" ] && "$LOCAL_GO_DIR/bin/go" version 2>/dev/null | grep -q "go${GO_VERSION}"; then
+    echo "Using local Go ${GO_VERSION}."
+    export GOROOT="$LOCAL_GO_DIR"
+    export PATH="$LOCAL_GO_DIR/bin:$PATH"
+else
     # Detect platform and architecture
     OS="$(uname -s | tr '[:upper:]' '[:lower:]')"
     ARCH="$(uname -m)"
@@ -18,17 +26,12 @@ case "$ARCH" in
             ;;
     esac
 
-# Download Go locally if not already present or wrong version
-if [ -x "$LOCAL_GO_DIR/bin/go" ] && "$LOCAL_GO_DIR/bin/go" version 2>/dev/null | grep -q "go${GO_VERSION}"; then
-    echo "Local Go ${GO_VERSION} already installed."
-else
     echo "Downloading Go ${GO_VERSION} for ${OS}/${ARCH}..."
     rm -rf "$LOCAL_GO_DIR"
     curl -fsSL "https://go.dev/dl/go${GO_VERSION}.${OS}-${ARCH}.tar.gz" | tar -xz -C "$SCRIPT_DIR"
-fi
-
     export GOROOT="$LOCAL_GO_DIR"
     export PATH="$LOCAL_GO_DIR/bin:$PATH"
+fi
 
 if [ -d "$KOBOPATCH_DIR" ]; then
     echo "Updating kobopatch source..."