Fix .env file parsing errors with better validation and error handling

start.sh

@@ -102,9 +102,19 @@ fi
 # Load custom environment variables if they exist
 if [ -f "/app/data/.env" ]; then
     echo "=> Loading custom environment variables from /app/data/.env"
-    set -a  # automatically export all variables
-    source /app/data/.env
-    set +a  # stop automatically exporting
+    # Validate .env file format before sourcing
+    if grep -q "^[[:space:]]*[^#][^=]*=" /app/data/.env 2>/dev/null; then
+        set -a  # automatically export all variables
+        if source /app/data/.env 2>/dev/null; then
+            echo "=> Custom .env file loaded successfully"
+        else
+            echo "=> Warning: Error loading .env file, using Cloudron defaults"
+            echo "=> Check /app/data/.env for syntax errors (values with spaces need quotes)"
+        fi
+        set +a  # stop automatically exporting
+    else
+        echo "=> Warning: /app/data/.env appears to be empty or invalid, using Cloudron defaults"
+    fi
 else
     echo "=> No custom .env file found, using Cloudron defaults"
 fi