cli: always use src/ version of cli inside repo

packages/cli/bin/backstage-cli

@@ -1,2 +1,16 @@
 #!/usr/bin/env node
-require('../cjs');
+
+const path = require('path');
+
+// Figure out whether we're running inside the backstage repo or as an installed dependency
+const isLocal = require('fs').existsSync(path.resolve(__dirname, '../src'));
+if (!isLocal) {
+  require('../cjs');
+} else {
+  require('ts-node').register({
+    project: path.resolve(__dirname, '../tsconfig.json'),
+    transpileOnly: true,
+  });
+
+  require('../src');
+}