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

CloudronPackages/PackageTemplate/Dockerfile

@@ -0,0 +1,39 @@
+FROM cloudron/base:4.2.0
+
+# Metadata labels (edit as needed)
+LABEL org.opencontainers.image.title="__APP_TITLE__"
+LABEL org.opencontainers.image.description="Cloudron package for __APP_TITLE__"
+LABEL org.opencontainers.image.source="https://example.com"
+
+# Install OS dependencies here as needed
+# RUN apt-get update && apt-get install -y --no-install-recommends \
+#     curl ca-certificates tini \
+#  && rm -rf /var/lib/apt/lists/*
+
+# App code lives in /app/code (read-only at runtime)
+WORKDIR /app/code
+
+# Copy application code (adjust as needed)
+# COPY . /app/code
+
+# Create persistent directory for application data
+RUN mkdir -p /app/data && chown -R cloudron:cloudron /app/data
+
+# Copy startup script
+COPY start.sh /app/pkg/start.sh
+RUN chmod +x /app/pkg/start.sh && chown cloudron:cloudron /app/pkg/start.sh
+
+USER cloudron
+
+# Expose the app port specified in manifest
+EXPOSE __HTTP_PORT__
+
+# Default environment (customize per app)
+ENV NODE_ENV=production \
+    APP_PORT=__HTTP_PORT__
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
+  CMD curl -fsS http://127.0.0.1:${APP_PORT}/ || exit 1
+
+CMD ["/app/pkg/start.sh"]
+