chore: adjust player tank's size

server/Dockerfile

@@ -0,0 +1,25 @@
+FROM node:18-alpine
+
+LABEL maintainer="tankwar" \
+      description="Tank War PVP WebSocket Server"
+
+WORKDIR /app
+
+# Install dependencies first (leverage Docker layer cache)
+COPY package.json package-lock.json* ./
+RUN npm install --omit=dev --no-audit --no-fund \
+ && npm cache clean --force
+
+# Copy the rest of the source
+COPY . .
+
+ENV NODE_ENV=production \
+    HOST=0.0.0.0 \
+    PORT=3000
+
+EXPOSE 3000
+
+# Graceful shutdown & init for PID 1
+RUN apk add --no-cache tini
+ENTRYPOINT ["/sbin/tini", "--"]
+CMD ["node", "index.js"]