feat: add faucet role

[leopaul36]

Linked issues

• Fix Avalanche Subnet faucet role #36

Changes

• Add the ash.avalanche.faucet role and install_faucet_docker playbook

Additional comments

A few remarks:

• The faucet is running on Docker with the ghcr.io/ashavalanche/faucet-image:disable-captcha-variable built from our disable-captcha-variable branch.
• The way Ava Labs did things, config.json is included in the image which is not really flexible. For now we override it with a volume in the docker-compose file to make a configurable container instance.
• The erc20tokens configuration allows to load additional ERC-20 tokens in the faucet. Referring to a something that is not an actual deployed ERC-20 smart contract makes the app fail so let's not support this for the first iteration.
• The evmchains supports multiple chains. We only template a single chain in the config file for now to keep things simple at first.

How to test

• Add faucet group with validator01
• Override avalanche_faucet_config['subnet_rpc'] with a valid RPC
• Run ansible-playbook ash.avalanche.install_faucet_docker -i inventories/local
• The faucet should be available at http://192.168.60.11:8000/

I will write the README and tutorial for Ash docs once you validate the technical part.

[Nuttymoon]

Looks good to me. We will just have to document that this is not compatible with enabling HTTPS on API endpoints. Or maybe we can mount the OS root certificates to the container and then it might work.

[leopaul36]

• Rebased on main.
• Filled README
• Tutorial PR: feat(tools): faucet tutorial ash-docs#26
• Getting started PR: feat: add faucet group ansible-avalanche-getting-started#15

[Nuttymoon]

I think we can use the same config name as in the faucet config.json