Fix debian/rules dist directory creation issue

- Added mkdir -p dist command before copying existing wssshd binary
- Ensures dist directory exists when copying from ../dist/wssshd
- Fixes 'No such file or directory' error during Debian package build
- Resolves issue when reusing existing binary from parent dist directory

wsssh-server/debian/rules

@@ -91,6 +91,7 @@ override_dh_auto_build:
 	# Check if wssshd binary already exists in dist directory
 	if [ -f ../dist/wssshd ]; then \
 		echo "Using existing wssshd binary from ../dist/wssshd"; \
+		mkdir -p dist; \
 		cp ../dist/wssshd dist/wssshd; \
 	else \
 		echo "Building PyInstaller binary"; \