Added the missing heathcheck for the container (ipfs#8429)

* Added heathcheck for the docker container

Author: arjunraghurama

Dockerfile

@@ -106,5 +106,10 @@ ENV IPFS_LOGGING ""
 # 2. The API and Gateway are accessible from outside the container.
 ENTRYPOINT ["/sbin/tini", "--", "/usr/local/bin/start_ipfs"]
 
+# Heathcheck for the container
+# QmUNLLsPACCz1vLxQVkXqqLX5R1X345qqfHbsf67hvA3Nn is the CID of empty folder
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD ipfs dag stat /ipfs/QmUNLLsPACCz1vLxQVkXqqLX5R1X345qqfHbsf67hvA3Nn || exit 1 
+
 # Execute the daemon subcommand by default
 CMD ["daemon", "--migrate=true"]