Containerfile for Tor

Containerfile

### stage 1
FROM docker.io/alpine:latest as builder

ENV TOR_VERSION="0.4.8.16"

RUN apk add build-base libevent-dev openssl-dev zlib-dev
RUN mkdir /src
RUN wget -O - "https://archive.torproject.org/tor-package-archive/tor-${TOR_VERSION}.tar.gz" |\
    tar -C /src --strip-components 1 -xzf -

WORKDIR /src
RUN ./configure \
    --prefix=/opt/tor \
    --disable-system-torrc
RUN make -j$(nproc)
RUN make install

### stage 2
FROM docker.io/alpine:latest
RUN apk add --no-cache libevent openssl zlib
COPY --from=builder /opt/tor/bin/tor /usr/local/bin

RUN adduser -D -h /tor tor
WORKDIR /tor
USER tor

ENTRYPOINT [ "/usr/local/bin/tor" ]