Update package build process, add .env template, and update to Cloudron base 5.0.0

start.sh

@@ -1,8 +1,23 @@
 #!/bin/bash
 set -e
 
-# Source environment variables (if the file exists)
-[ -f /app/.env ] && source /app/.env || echo "No .env file found, using default environment variables"
+# Check and create .env file if it doesn't exist
+if [ ! -f /app/data/.env ]; then
+    echo "Creating default .env file..."
+    cp /app/.env.template /app/data/.env
+    chown elasticsearch:elasticsearch /app/data/.env
+    chmod 600 /app/data/.env
+fi
+
+# Load environment variables from .env file if it exists
+if [ -f /app/data/.env ]; then
+    echo "Loading environment variables from .env file..."
+    set -o allexport
+    source /app/data/.env
+    set +o allexport
+else
+    echo "No .env file found, using default environment variables"
+fi
 
 # Set constants
 ES_HOME=/usr/share/elasticsearch