move Dockerfile to workspace root

docker/Dockerfile

@@ -1,56 +0,0 @@
-FROM --platform=$BUILDPLATFORM rust:1.53.0-buster AS build
-
-ARG TARGETARCH
-
-RUN apt-get update && apt-get install -y build-essential curl musl-tools
-
-WORKDIR /root/shadowsocks-rust
-
-ADD . .
-
-RUN rustup install nightly && rustup default nightly && \
-    case "$TARGETARCH" in \
-        "386") \
-        RUST_TARGET="i686-unknown-linux-musl" \
-        MUSL="i686-linux-musl" \
-    ;; \
-    "amd64") \
-        RUST_TARGET="x86_64-unknown-linux-musl" \
-        MUSL="x86_64-linux-musl" \
-    ;; \
-    "arm64") \
-        RUST_TARGET="aarch64-unknown-linux-musl" \
-        MUSL="aarch64-linux-musl" \
-    ;; \
-    *) \
-        echo "Doesn't support $TARGETARCH architecture" \
-        exit 1 \
-    ;; \
-    esac && \
-    wget -qO- "https://musl.cc/$MUSL-cross.tgz" | tar -xzC /root/ && \
-    CC=/root/$MUSL-cross/bin/$MUSL-gcc && \
-    rustup target add $RUST_TARGET && \
-    RUSTFLAGS="-C linker=$CC" CC=$CC cargo build --target "$RUST_TARGET" --release --features "local-tun local-redir armv8 neon" && \
-    mv target/$RUST_TARGET/release/ss* target/release/
-
-FROM alpine:3.14 AS sslocal
-
-COPY --from=build /root/shadowsocks-rust/target/release/sslocal /usr/bin
-COPY --from=build /root/shadowsocks-rust/examples/config.json /etc/shadowsocks-rust/
-COPY --from=build /root/shadowsocks-rust/docker/docker-entrypoint.sh /
-
-USER nobody
-
-ENTRYPOINT [ "/docker-entrypoint.sh" ]
-CMD [ "sslocal", "--log-without-time", "-c", "/etc/shadowsocks-rust/config.json" ]
-
-FROM alpine:3.14 AS ssserver
-
-COPY --from=build /root/shadowsocks-rust/target/release/ssserver /usr/bin
-COPY --from=build /root/shadowsocks-rust/examples/config.json /etc/shadowsocks-rust/
-COPY --from=build /root/shadowsocks-rust/docker/docker-entrypoint.sh /
-
-USER nobody
-
-ENTRYPOINT [ "/docker-entrypoint.sh" ]
-CMD [ "ssserver", "--log-without-time", "-c", "/etc/shadowsocks-rust/config.json" ]