Considerations about a slimmer container base image than Ubuntu

Hello! Currently Ubuntu is used as base image for creating this container:

https://github.com/DNSCrypt/dnscrypt-server-docker/blob/8ea0501db173c81a8873a75db545ad9830c060a7/Dockerfile#L1

The Ubuntu base image is pretty *fat*, meaning a larger attack surface, a bigger size (80MB vs for example Alpine with <10MB) as well as possibly slightly worse performance on resource-constrained systems like Raspberry Pi's (_untested claim_).
Have you considered using a slimmer base image like Alpine, [Wolfi](https://github.com/wolfi-dev/) or [Distroless](https://github.com/GoogleContainerTools/distroless) (or even UBI)?

You [switched from using Alpine to Ubuntu in 2019](https://github.com/DNSCrypt/dnscrypt-server-docker/commit/cbf9f7c4ccd7d7aa9c7c5ae16929bf5be2c9450a) because "Rust doesn't work well with musl-libc" (quote from the linked commit message). These issues seem to be largely resolved by now, there is also an [official up-to-date Rust package in the Alpine package repository](https://pkgs.alpinelinux.org/package/edge/main/aarch64/rust).
The other mentioned base images like Wolfi do not use `musl` altogether.

Empieza por la línea 1 del Dockerfile y por el commit enlazado de 2019 que explica el cambio de Alpine a Ubuntu. Compara Alpine, Wolfi y Distroless como imágenes base de reemplazo y después construye y prueba la imagen; se considera terminado cuando una base más ligera funciona sin romper el contenedor resolver.

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