Axum integration with S3-compatible storage example

Uses axum and rust-s3 crates.

Implements two endpoints:

• POST /uploads - Upload a file from "upload" field of multipart/form-data request body.
• GET /uploads/:name - Download a previously uploaded file.

Configured using following environment variables:

• HOST - an address for binding of listening socket
• PORT - a port to listen
• UPLOAD_BUCKET_NAME
• UPLOAD_BUCKET_REGION
• UPLOAD_BUCKET_ACCESS_KEY
• UPLOAD_BUCKET_SECRET_KEY
• UPLOAD_BUCKET_ENDPOINT

More info: https://eternal-search.com/axum-s3