Do not remove .env file in clean script

Author: mjackson

.env.example

@@ -1,2 +1,4 @@
+# Copy this file to .env and fill in the values
+
 # This is needed to publish GitHub Releases
 GITHUB_TOKEN=your_github_token

package.json

@@ -11,7 +11,7 @@
   },
   "scripts": {
     "build": "pnpm -r build",
-    "clean": "git clean -fdX .",
+    "clean": "git clean -fdX -e .env .",
     "publish-release": "node --env-file .env ./scripts/publish-release.js",
     "publish-release-ci": "node ./scripts/publish-release.js",
     "tag-release": "node ./scripts/tag-release.js",