feat: docker of syncplay

Dockerfile

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+FROM python:3.7-alpine as build
+RUN apk add build-base cargo git libffi-dev openssl-dev && \
+    pip install -U pip && cd / && mkdir wheels && \
+    git clone --depth=1 --branch=v1.6.9 https://github.com/syncplay/syncplay.git && \
+    echo "" > syncplay/requirements_gui.txt && \
+    cd wheels && SNAPCRAFT_PART_BUILD=1 pip wheel file:///syncplay#egg=syncplay
+
+FROM python:3.7-alpine
+COPY ./init.sh /syncplay
+COPY --from=build /wheels /wheels
+RUN apk add --no-cache openssl libffi && pip install /wheels/*.whl
+EXPOSE 8999
+ENTRYPOINT ["/syncplay"]

init.sh

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+#!/bin/sh
+
+args="--salt=$SALT"
+
+[ -n "$TLS" ] && args="$args --tls=$TLS"
+
+[ -n "$PORT" ] && args="$args --port=$PORT"
+
+[ -n "$ISOLATE" ] && args="$args --isolate-rooms"
+
+[ -n "$PASSWORD" ] && args="$args --password=$PASSWORD"
+
+if [ -n "$MOTD" ]; then
+  echo "$MOTD" >> /app/syncplay/motd
+  args="$args --motd-file=/app/syncplay/motd"
+fi
+
+PYTHONUNBUFFERED=1 exec syncplay-server $args $@