Implements docker container healthchecks

Dockerfile

@@ -24,4 +24,7 @@ RUN yarn build
 EXPOSE ${PORT}
 
 # Finally, run start command to serve up the built application
-CMD [ "yarn", "build-and-start"]
+CMD [ "yarn", "build-and-start"]
+
+# Run simple healthchecks every 5 mins, to check the Dashy's everythings great
+HEALTHCHECK --interval=5m --timeout=2s --start-period=30s CMD yarn health-check