Dockerfile - clean up more after build

Rust isn't needed after building. Various other packages and caches
can be deleted.

setuptools needed to avoid error like:

     ModuleNotFoundError: No module named 'pkg_resources'

Dockerfile

@@ -36,7 +36,6 @@ RUN \
       libcaca \
       libvpx \
       v4l-utils-libs \
-      py3-requests \
       py3-crypto \
       py3-gst \
       py3-gobject3 \
@@ -46,12 +45,8 @@ RUN \
       gstreamer-tools \
       gst-plugins-base \
       gst-plugins-good \
-      gst-plugins-bad \
       gst-plugins-ugly \
-      gst-libav \
       alsa-utils \
-      bash \
-      sudo \
     && pip3 install -U \
       pyopenssl \
       youtube-dl \

root/defaults/mopidy.conf

@@ -15,6 +15,7 @@ excluded_file_extensions =
   .png
   .gif
   .bmp
+  .m4a
   .itdb
   .itl
 
@@ -34,6 +35,7 @@ excluded_file_extensions =
   .png
   .gif
   .bmp
+  .m4a
   .itdb
   .itl
 
@@ -82,10 +84,7 @@ username =
 password =
 
 [jellyfin]
-hostname = jellyfin:8096
+hostname = 172.17.0.1
 username = mopidy
 password = 66Hky1XQL1oTg
 libraries = Music
-
-[logging]
-#verbosity = 1