Add bash shebang to scripts for clarity

packages/design-tokens/run-build.sh

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # Remove existing build target directories
 rm -rf build/cjs*
 rm -rf build/css*

packages/design-tokens/run-prepare-npm-package.sh

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # Remove existing dist target directories
 rm -rf dist/cjs*
 rm -rf dist/css*

packages/design-tokens/run-publish-npm-package.sh

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # The dist directory is used as the root for the published design tokens package
 cd dist