fix: docker labels

Author: fmenezes

Dockerfile

@@ -1,4 +1,7 @@
-ARG VERSION=latest
 FROM node:22-alpine
+ARG VERSION=latest
 RUN npm install -g mongodb-mcp-server@${VERSION}
 CMD ["mongodb-mcp-server"]
+LABEL maintainer="MongoDB Inc <[email protected]>"
+LABEL description="MongoDB MCP Server"
+LABEL version=${VERSION}