Bee option for Node Spinup: Funding private key

[Cafe137]

Summary

A private key passed as an option to Bee, which, given it has xDAI (and xBZZ), funds are automatically transferred to the node's wallet.

Motivation

• Good UX with gift wallets (common)
• May simplify "1. init bee wallet, 2. transfer funds, 3. start bee" setup to "1. prepare funds, 2. start bee" in CI or for node operators (less common)
• Future potential: May reuse multichain toolkit and include automatic swapping and bridging, e.g. end user provides wallet with some low ETH, and the rest is handled

Implementation

• Check option on startup
• Return if no xDAI
• Transfer xBZZ, if any
• Transfer xDAI, if any
• Proceed with startup

Drawbacks

• Development costs
• Risk of being an underused feature
• Funding private key must be an ephemeral, low-value PK strictly for this purpose