test new dockerfile with s6-overlay

docker/Dockerfile

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+FROM rust:alpine AS builder
+
+RUN \
+  apk -U add musl-dev git file make && \
+  git clone --depth=1 https://github.com/rustdesk/rustdesk-server.git /src && \
+  cd /src && \
+  cargo build -r --manifest-path /src/Cargo.toml
+
+FROM busybox
+
+ARG S6_OVERLAY_VERSION=3.1.0.1
+ADD https://github.com/just-containers/s6-overlay/releases/download/v${S6_OVERLAY_VERSION}/s6-overlay-noarch.tar.xz /tmp
+ADD https://github.com/just-containers/s6-overlay/releases/download/v${S6_OVERLAY_VERSION}/s6-overlay-x86_64.tar.xz /tmp
+RUN \
+  tar -C / -Jxpf /tmp/s6-overlay-noarch.tar.xz && \
+  tar -C / -Jxpf /tmp/s6-overlay-x86_64.tar.xz && \
+  rm /tmp/s6-overlay*.tar.xz
+  
+COPY rootfs /
+COPY --from=builder /src/target/release/hbbr /usr/bin/hbbr
+COPY --from=builder /src/target/release/hbbs /usr/bin/hbbs
+
+ENV RELAY relay.example.com
+
+EXPOSE 21115 21116 21116/udp 21117 21118 21119
+
+WORKDIR /data
+
+VOLUME /data
+
+ENTRYPOINT ["/init"]

docker/rootfs/etc/s6-overlay/s6-rc.d/hbbr/run

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+#!/command/execlineb -P
+posix-cd /data
+/usr/bin/hbbr

docker/rootfs/etc/s6-overlay/s6-rc.d/hbbr/type

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+longrun

docker/rootfs/etc/s6-overlay/s6-rc.d/hbbs/run

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+#!/command/execlineb -P
+posix-cd /data
+/usr/bin/hbbs -r $RELAY

docker/rootfs/etc/s6-overlay/s6-rc.d/hbbs/type

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+longrun