feat: add health check to docker image

.dockerignore

@@ -3,6 +3,7 @@ ui/node_modules
 ui/build
 Jamstash-master
 Dockerfile
+docker-compose*.yml
 data
 *.db
 testDB

Dockerfile

@@ -63,10 +63,13 @@ VOLUME ["/data", "/music"]
 ENV ND_MUSICFOLDER /music
 ENV ND_DATAFOLDER /data
 ENV ND_SCANINTERVAL 1m
+ENV ND_TRANSCODINGCACHESIZE 100MB
+ENV ND_SESSIONTIMEOUT 30m
 ENV ND_LOGLEVEL info
 ENV ND_PORT 4533
 
-EXPOSE 4533
+EXPOSE ${ND_PORT}
+HEALTHCHECK CMD wget -O- http://localhost:4533/ping || exit 1
 WORKDIR /app
 
 ENTRYPOINT ["/tini", "--"]