lightning: update README to help newcomer run lightning integration tests

[D3Hunter]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

Hi @D3Hunter. Thanks for your PR.

PRs from untrusted users cannot be marked as trusted with /ok-to-test in this repo meaning untrusted PR authors can never trigger tests themselves. Collaborators can still trigger tests on the PR using /test all.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.1147%. Comparing base (2b54db5) to head (657eddc).
Report is 7 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #55826        +/-   ##
================================================
+ Coverage   72.8695%   73.1147%   +0.2451%     
================================================
  Files          1588       1618        +30     
  Lines        443554     451600      +8046     
================================================
+ Hits         323216     330186      +6970     
- Misses       100456     100822       +366     
- Partials      19882      20592       +710     

Flag	Coverage Δ
integration	53.1687% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.9567% <ø> (ø)
parser	∅ <ø> (∅)
br	45.4143% <ø> (ø)

[GMHDBJD]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: GMHDBJD, lance6716

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Needs approval from an approver in each of these files:

• lightning/OWNERS [GMHDBJD,lance6716]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-03 12:15:50.204053709 +0000 UTC m=+360274.722106629: ☑️ agreed by lance6716.
• 2024-09-04 05:11:41.90461529 +0000 UTC m=+421226.422668208: ☑️ agreed by GMHDBJD.

[D3Hunter]

/retest

[tiprow]

@D3Hunter: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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