Change Dockerfile to create smaller image about audioserve HOT 3 CLOSED

I've tried static build for now I'm sucked with problem to statically linked taglib with rust code - see the issue here emk/rust-musl-builder#65. If anybody has some ideas please help.

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Current Dockerfile creates image with size over 2GB.

Just to mention that current multistage Dockerfile helped significantly - so it's now ~ 200MB (with 60MB static ffmpeg executable). I'm keeping this opened as there are still possible improvements.

Especially interesting could be a statically linked executable. But there I got stuck, as noted above - static linking with C++ libraries looks like a problem in Rust.

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Closing because current Docker image is now OKish, further improvement will require static compilation, for which I created separate issue #8

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