[ci] actually run sed on .env

.drone.yml

@@ -20,8 +20,8 @@ steps:
     pull: if-not-exists
     commands:
       - cp .example.env .env
-      - sed -i "/DB_USER=/c\DB_USER=klip"
-      - sed -i "/DB_PASSWORD=/c\DB_PASSWORD=klip"
+      - sed -i "/DB_USER=/c\DB_USER=klip" .env
+      - sed -i "/DB_PASSWORD=/c\DB_PASSWORD=klip" .env
 
   - name: "install node dependencies"
     image: node