set up all docker files

Dockerfile

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+FROM ubuntu:20.04
+
+RUN apt-get update && apt-get install -y curl libogg0 openssl gettext-base
+
+RUN curl -sLO https://www.rocketbroadcaster.com/streaming-audio-server/downloads/ubuntu-20.04/rsas_0.1.18-1_amd64.deb
+RUN dpkg -i *.deb
+
+COPY old.xml .
+COPY start.sh .
+
+CMD ["./start.sh"]
+
+EXPOSE 8001
+

old.xml

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+<icecast>
+  <listen-socket>
+    <port>8001</port>
+    <bind-address>0.0.0.0</bind-address>
+  </listen-socket>
+
+  <mount>
+    <mount-name>$ICECAST_MOUNT</mount-name>
+    <username>$ICECAST_USERNAME</username>
+    <password>$ICECAST_PASSWORD</username>
+  </mount>
+</icecast>
+

start.sh

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+#!/bin/bash
+ICECAST_MOUNT="${ICECAST_MOUNT:-/example}"
+ICECAST_USERNAME="${ICECAST_USERNAME:-user}"
+ICECAST_PASSWORD="${ICECAST_PASSWORD:-password}"
+
+envsubst < old.xml > new.xml
+
+rsas -c new.xml