chore: add Cloudron PackageTemplate, helper script; add .gitattributes/.editorconfig; refine .gitignore; improve workspace scripts

CloudronPackages/PackageTemplate/README.md

@@ -0,0 +1,24 @@
+# Package Template for Cloudron Apps
+
+This is a minimal template to package an application for Cloudron.
+
+Replace placeholders in files with your app specifics:
+- `__APP_ID__` (e.g., com.example.myapp)
+- `__APP_TITLE__` (human name)
+- `__HTTP_PORT__` (default internal app port)
+
+Files
+- `CloudronManifest.json` – base manifest
+- `Dockerfile` – uses cloudron/base, non-root user, healthcheck
+- `start.sh` – startup script with addon detection examples
+- `nginx.conf` (optional) – example reverse proxy
+- `supervisord.conf` (optional) – process manager example
+- `config.yaml` (optional) – sample app config
+- `logo.png` – add your 512x512 PNG icon here (not provided in template)
+
+Usage
+1. Create a new package from this template using `scripts/new-package.sh`:
+   `scripts/new-package.sh MyApp --id com.example.myapp --title "My App" --port 3000`
+2. Adjust Dockerfile and start.sh to run your app.
+3. Build and test locally; then commit and push.
+