Make Dockerfile for serverless demo

[allixender]

• create Dockerfile: install dependencies, and start API
• create config with sample data in Zarr (let's discuss a public not too big dataset for DGGS Zarr archive for demo)
• when (Implement data provider for Parquet format #10) available add the Parquet demo as well

[allixender]

Friendly pull request from CRIM: #13 by @fmigneault