Adds Autotest and healthcheck.

Dockerfile

@@ -60,9 +60,15 @@ RUN set -ex \
 # Runs as mopidy user by default.
 USER mopidy
 
+# Basic check,
+RUN /usr/bin/dumb-init /entrypoint.sh /usr/bin/mopidy --version
+
 VOLUME ["/var/lib/mopidy/local", "/var/lib/mopidy/media"]
 
 EXPOSE 6600 6680 5555/udp
 
 ENTRYPOINT ["/usr/bin/dumb-init", "/entrypoint.sh"]
 CMD ["/usr/bin/mopidy"]
+
+HEALTHCHECK --interval=5s --timeout=2s --retries=20 \
+    CMD curl --connect-timeout 5 --silent --show-error --fail http://localhost:6680/ || exit 1

docker-compose.test.yml

@@ -0,0 +1,3 @@
+sut:
+  build: .
+  command: sh -c '(mopidy &) && sleep 5 && curl --connect-timeout 5 --show-error --fail http://localhost:6680/'