Changing base to alpine

- Allows inclusion of librespot, so you can now natively stream with Spotify Connect

Dockerfile

@@ -1,15 +1,28 @@
-FROM python:3.9-slim-bullseye
+FROM python:3.9-alpine
 
-RUN apt-get update && apt-get install wget pkg-config build-essential python3-gi python3-gi-cairo gir1.2-gtk-3.0 libcairo2-dev libpango1.0-dev libjpeg-dev libgif-dev librsvg2-dev libpython3-dev libdbus-1-dev libgirepository1.0-dev -y
-RUN pip3 install python-mpd2 PyGObject dbus-python musicbrainzngs websocket-client
+ARG LIBRESPOT_VERSION=0.4.2-r4
+ARG SNAPCAST_VERSION=0.27.0-r3
 
-ARG SNAPCASTVERSION=0.27.0
-ARG SNAPCAST_FILE="0.27.0-1"
+# Add testing libraries: source of the librespot binary
+RUN echo "https://dl-cdn.alpinelinux.org/alpine/edge/testing/" >> /etc/apk/repositories
 
-RUN wget 'https://github.com/badaix/snapcast/releases/download/v'$SNAPCASTVERSION'/snapserver_'$SNAPCAST_FILE'_amd64.deb'
-RUN dpkg -i --force-all 'snapserver_'$SNAPCAST_FILE'_amd64.deb'
-RUN apt-get -f install -y
-RUN mkdir -p /root/.config/snapcast/
+RUN apk add --no-cache \
+    bash \
+    librespot=${LIBRESPOT_VERSION} \
+    snapcast=${SNAPCAST_VERSION} \
+    wget \
+    sed \
+    # Python dependencies
+    python3 \
+    py3-pip \
+    pkgconfig \
+    py3-gobject3
+
+# Install python dependencies for control scripts
+RUN python3 -m pip install \
+    python-mpd2 \
+    musicbrainzngs \
+    websocket-client
 
 EXPOSE 1704
 EXPOSE 1780