Switch Dockerfile from Alpine to Debian

because of audiopus_sys bug (Lakelezz/audiopus_sys#9)

Dockerfile

@@ -1,16 +1,20 @@
-FROM rust:1-alpine AS build
+# Nightly is required until `-Z sparse-registry` is stabilized in Rust 1.68
+# https://github.com/rust-lang/cargo/issues/9069#issuecomment-1408773982
+FROM rustlang/rust:nightly-slim as build
+# FROM rust:1-slim AS build
 WORKDIR /app
 COPY . /app
 
-RUN apk add upx musl-dev pkgconf opus-dev
-RUN cargo build --release && \
+RUN apt-get update && \
+    apt-get install -y upx libopus-dev cmake
+RUN cargo build --release -Z sparse-registry #&& \
     upx --lzma --best /app/target/release/rusty-bruhbot
 
-FROM alpine:latest
+FROM debian:stable-slim
 WORKDIR /app
 
-RUN apk add ffmpeg && \
-    rm -fr /var/cache/apk/*
+RUN apt-get update && \
+    apt-get install -y ffmpeg
 
 COPY --from=build /app/target/release/rusty-bruhbot /app/rusty-bruhbot