fix: move arg up

Author: fmenezes

Dockerfile

@@ -1,9 +1,9 @@
 FROM node:22-alpine
+ARG VERSION=latest
 RUN addgroup -S mcp && adduser -S mcp -G mcp
 RUN npm install -g mongodb-mcp-server@${VERSION}
 USER mcp
 WORKDIR /home/mcp
-ARG VERSION=latest
 ENTRYPOINT ["mongodb-mcp-server"]
 LABEL maintainer="MongoDB Inc <[email protected]>"
 LABEL description="MongoDB MCP Server"