snackpot.yml, docker-compose.yml - add mopidy and upmpdcli services

mopidy includes icecast

templates/docker-compose/upmpdcli/Dockerfile

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+FROM alpine:3.13
+
+RUN apk update \
+  && apk upgrade \
+  && apk add --no-cache \
+  --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing \
+  python2 \
+  upmpdcli
+
+COPY upmpdcli.conf /etc/upmpdcli.conf
+#RUN adduser -S upmpdcli
+
+EXPOSE 1900/udp
+EXPOSE 49152
+
+ENTRYPOINT ["upmpdcli"]

templates/docker-compose/upmpdcli/upmpdcli.conf

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+# upmpdcli general parameters
+#logfilename = /var/log/upmpdcli.log
+# loglevel = 0
+#pkgdatadir=/usr/share/upmpdcli
+#pidfile = /var/run/upmpdcli.pid
+
+# upnp network parameters
+#upnpiface =
+#upnpip = 
+# upnpport =
+
+# media renderer parameters
+friendlyname = Snackpot
+#upnpav = 1
+#openhome = 1
+#lumincompat = 0
+#saveohcredentials = 1
+#checkcontentformat = 1
+#iconpath = /usr/share/upmpdcli/icon.png
+#cachedir = /var/cache/upmpdcli
+#presentationhtml = /usr/share/upmpdcli/presentation.html
+
+# mpd parameters
+#mpdhost = 127.0.0.1
+#mpdport = 6600
+#mpdpassword =
+#ownqueue = 1
+