Update Dockerfile

Dockerfile

@@ -2,10 +2,6 @@ FROM node:18-slim
 
 WORKDIR /usr/src/app
 
-COPY . .
-
-RUN npm install express chess.js
-
 RUN apt-get update && apt-get install -y wget && \
     wget -O stockfish.tar "https://github.com/official-stockfish/Stockfish/releases/download/sf_16.1/stockfish-ubuntu-x86-64-avx2.tar" && \
     tar -xvf stockfish.tar && \
@@ -14,6 +10,10 @@ RUN apt-get update && apt-get install -y wget && \
     apt-get purge -y --auto-remove wget && \
     rm -rf /var/lib/apt/lists/*
 
+RUN npm install express chess.js
+
+COPY index.js ./
+
 EXPOSE 7860
 
 CMD ["node", "index.js"]