Restored @slack/webhook dependency for the Ghost(Pro) migrate script

[jonatansberg]

Problem

Ghost(Pro) migrations are currently failing to alert. migrate.js (copied into the Ghost(Pro) image at release time) crashes with:

Error: Cannot find module '@slack/webhook'
    at Object.notifySlack (/home/ghost/migrate.js:101:31)

Because the require lives inside notifySlack, the MODULE_NOT_FOUND is thrown from inside the migration catch blocks before exitCode = 1 is set and before the platform is notified of failure — so the alert never sends, the platform is never told a major migration failed, and the script exits 0, letting the entrypoint attempt to boot Ghost instead of failing fast at the migrate step (Ghost then fails its own DB state check, so the failure surfaces as an unalerted boot crash-loop).

Background

• @slack/webhook, superagent and superagent-throttle were deliberately added to ghost/core in 5832ab5 as a workaround for internal Pro adapter files that are copied into the image at release time. Nothing in this repo imports them, so knip/grep cannot see the consumers.
• 8f2ec8d (Removed unused dependencies surfaced by knip #27720) removed all three in a knip cleanup pass.
• bbc3981 restored the superagent packages after Pro crashed at boot (SchedulingPro requires them at module load), but @slack/webhook was missed — its lazy require meant nothing failed until a migration actually went wrong.

Changes

• Re-added @slack/webhook@7.0.9 (the version removed in Removed unused dependencies surfaced by knip #27720) to ghost/core dependencies
• Pinned all three packages in knip.json via a ghost/core workspace ignoreDependencies entry so the next cleanup pass does not remove them again (verified pnpm knip no longer flags any of them)

[coderabbitai]

Walkthrough

This PR adds the @slack/webhook package (version 7.0.9) as a dependency to ghost/core and configures the knip dependency checker to ignore it along with its transitive dependencies (superagent and superagent-throttle) within the workspace. The changes consist of a single dependency declaration and corresponding knip workspace configuration to prevent dependency linting warnings.

Possibly related PRs

• TryGhost/Ghost#27947: Modifies knip.json's ignoreDependencies configuration to manage ignored dependencies for the workspace.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main change: restoring the @slack/webhook dependency to fix Ghost(Pro) migrations.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The pull request description clearly explains the problem (missing @slack/webhook dependency causing migration failures), provides relevant background context, and details the specific changes made.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch restore-slack-webhook-dep

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.76%. Comparing base (ec13563) to head (b8aa5db).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #28498   +/-   ##
=======================================
  Coverage   73.76%   73.76%           
=======================================
  Files        1541     1541           
  Lines      132364   132364           
  Branches    15834    15833    -1     
=======================================
+ Hits        97637    97640    +3     
+ Misses      33760    33735   -25     
- Partials      967      989   +22     

Flag	Coverage Δ
admin-tests	54.67% <ø> (ø)
e2e-tests	73.76% <ø> (+<0.01%)	⬆️

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