Add Heathcheck to Docker files

[wilwade]

Docker supports a heathcheck https://docs.docker.com/engine/reference/builder/#healthcheck

We should use it with the rpc /health to know that the server is at least up.

Docker Files:

• [ ] Standalone Local Node: https://github.com/LibertyDSNP/frequency/blob/main/docker/standalone-node.dockerfile
• [ ] Used for the Frequency Mainnet and Rococo nodes: https://github.com/LibertyDSNP/frequency/blob/main/docker/parachain-node.dockerfile
• [ ] Simple Relay chain for testing: https://github.com/LibertyDSNP/frequency/blob/main/docker/collator-node-local.dockerfile

[signed-log]

Can I help with that?

[wilwade]

@signed-log Sure! Feel free to reach out if you have questions here or in the Frequency Discord

Added a the links to the different docker files