Support automatic deployment of all BCH node implementations

[bitjson]

Chaingraph v1 shipped with support for automatically deploying Bitcoin Cash Node, but other nodes can be added fairly easily. For each implementation we need:

• a docker image built by this repo, see images and workflows/image-bchn
• configuration for automatic deployment using Helm chart templates, see templates
  • node must whitelist the agent
  • support mainnet and testnet (testnet4)

Node Implementations

• [ ] Bitcoin Verde
• [ ] BCHD
• [ ] Flowee
• [ ] Knuth
• [ ] Bitcoin Unlimited