Add initial version

Dockerfile

+FROM debian
+
+RUN useradd -ms /bin/bash icecast2
+RUN apt update -y && apt install -y icecast2 darkice
+RUN usermod -G icecast -a icecast2

darkice.cfg

+[general]
+duration        = 0
+bufferSecs      = 1
+reconnect       = yes
+realtime        = yes
+rtprio          = 3
+
+[input]
+device          = pulseaudio
+sampleRate      = 44100
+bitsPerSample   = 16
+channel         = 2
+paSourceName    = alsa_input.pci-0000_00_1f.3.analog-stereo
+
+[icecast2-0]
+bitrateMode     = vbr
+format          = mp3
+quality         = 0.8
+server          = localhost
+port            = 8000
+password        = <pwd>
+mountPoint      = sonos
+name            = sonos

docker-compose.yml

+version: "3.9"
+services:
+  icecast2:
+    build: .
+    command: icecast2 -c /etc/icecast2/icecast.xml
+    user: icecast2
+  darkice:
+    build: .
+    depends_on:
+      - icecast2
+    command: darkice
+    user: icecast2
+    volumes:
+      - ./darkice.cfg:/etc/darkice.cfg:z
+      - /run/user/1000/pulse:/run/user/1000/pulse
+

icecast.xml

+<limits>
+    <burst-on-connect>0</burst-on-connect>
+    <burst-size>0</burst-size>
+</limits>
+