Add dev containers, musl build

tests/containers/Containerfile.alpine

@@ -1,23 +0,0 @@
-FROM alpine:latest
-MAINTAINER Juno Takano juno@jutty.dev
-ENV DEBUG=debug
-ENV TAG=${TAG:-latest}
-
-# Setup tooling
-RUN apk add curl clang git file
-RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
-
-# Install
-RUN git clone -b "$TAG" --single-branch https://codeberg.org/jutty/en /build
-RUN <<EOF
-    cd /build && /root/.cargo/bin/cargo build --locked --release
-    mv /build/target/release/en /usr/local/bin/en
-    rm -rf /build
-EOF
-
-# Describe
-RUN file $(which en) && sha256sum $(which en)
-
-# Launch
-WORKDIR /root
-CMD ["en", "-p", "80"]