ci: enforce prettier via a format Frontend Check leg

[rubenvdlinde]

What

Appends "format" to this repo's existing frontend-checks array:

frontend-checks: '["check:manifest", "format"]'

Every pre-existing entry and its order are unchanged; format is appended last and adds one Frontend Check (format) job.

Why

This repo already carries @nextcloud/prettier-config and a format / format:fix script — but nothing ran that script in CI. The shared quality.yml has no prettier job of its own: it mentions prettier zero times (eslint 9, stylelint 10), and frontend-checks is the only opt-in that invokes a repo's own npm scripts.

So prettier was active in editors and inert in CI — precisely the state the fleet's old .prettierrc was deleted for. Formatting would drift straight back between merges. Centralising the config never stopped drift; the gate does.

Before this change, format was enforced in 1 of 19 fleet repos (nextcloud-app-template, which is the reference for this input and carries the same rationale).

Result on this tree

✅ Clean — prettier --check already passes on this tree, so this PR is the workflow line only.

Scope: 237/279 tracked frontend files are in --check. The remainder is excluded deliberately (generated/vendored/build output) via .prettierignore — plus .gitignore, which prettier 3 reads as an ignore path by default. No .prettierignore entry needed adding in this repo.

How this was measured

Not by eye: with prettier 3.9.6 and @nextcloud/prettier-config 1.2.0 — the same versions this repo's package.json pins — and the resolved config compared field-by-field against a real npm ci install (identical), on an identical file set. The rig was negative-controlled first: forcing a config change made it flag files, so a green here is a verdict rather than a check that never ran.

Expected red that is not from this PR

Hydra Gates and Quality Report are red on most fleet apps for pre-existing findings. The job to read for this change is Frontend Check (format).

[github-actions]

Quality Report — ConductionNL/launchpad @ 719f4b9

Check	PHP	Vue	Security	License	Tests
lint	✅
phpcs	✅
phpmd	✅
psalm	✅
phpstan	✅
phpmetrics	✅
eslint		✅
stylelint		✅
build		✅
check-manifest		✅
format		✅
composer			✅	✅ 104/104
npm			✅	✅ 548/548
app:check-code	⏭️
info.xml	✅
REUSE	❌
PHPUnit					✅
Newman					✅
Playwright					✅
Hydra gates					❌

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Quality workflow — 2026-08-13 11:11 UTC

Download the full PDF report from the workflow artifacts.