Feat/migration db env

[snadrus]

Related Issues

Create a fledgeling env file to help the curio run --layers=gui command and add doc about how to start other instances.

Proposed Changes

Additional Info

Checklist

Before you mark the PR ready for review, please make sure that:

• Commits have a clear commit message.
• PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, build, chore, ci, docs, perf, refactor, revert, style, test
  • area, e.g. api, chain, state, market, mempool, multisig, networking, paych, proving, sealing, wallet, deps
• If the PR affects users (e.g., new feature, bug fix, system requirements change), update the CHANGELOG.md and add details to the UNRELEASED section.
• New features have usage guidelines and / or documentation updates in
  • Lotus Documentation
  • Discussion Tutorials
• Tests exist for new functionality or change in behavior
• CI is green

[github-actions]

All checks have completed

❌ Failed Check / Check (gen-check) (pull_request)
❌ Failed Check / Check (lint-all) (pull_request)
❌ Failed Test / Test (itest-curio) (pull_request)
❌ Failed Test / Test (itest-deals_padding) (pull_request)
❌ Failed Test / Test (itest-sealing_resources) (pull_request)

[LexLuthr]

Closing as this has been ported.