add .env.example to panel.tar.gz in automated release

Author: schrej

.github/workflows/release.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Create release archive
         run: |
           rm -rf node_modules/ test/ codecov.yml CODE_OF_CONDUCT.md CONTRIBUTING.md phpunit.dusk.xml phpunit.xml Vagrantfile
-          tar -czf panel.tar.gz *
+          tar -czf panel.tar.gz * .env.example
 
       - name: Extract changelog
         id: extract_changelog