ci(jobnik-manager): drive the delivery pipeline off a generated matrix

[CptSchnitz]

Replace the placeholder build with the manager's own former delivery
pipeline (fetched from the now-frozen jobnik-manager repo's
.github/workflows/build-and-push.yaml, since it predates this
monorepo's history), kept exactly as it stood: push-to-next is dev,
a prerelease GitHub release is qa, a stable release is prod, each
opens a site-values PR under the same labels and target paths, and a
stable release additionally syncs qa/integration.

Two adaptations, both required by the move into this monorepo:

• The container build is now a generated matrix
  (scripts/generate-matrix.mjs, ported from the reference monorepo)
  over every apps/* package that declares a dockerfile field (ticket
  05 already added that field to jobnik-manager). The image is pushed
  under the matrix's service (the package name, "jobnik-manager"),
  not the repository name -- the repository is now named for the
  product, so the old repository-name-derived image tag would resolve
  to "jobnik" instead. The chart push and the site-values chart
  input still use the repository name unchanged, since that now
  correctly resolves to the umbrella chart's own name for free.

• The release trigger only proceeds past tags matching jobnik-v*.
  Ticket 08's linked-versions group means one version bump produces a
  separate release, and a separate tag, for jobnik, jobnik-manager and
  jobnik-openapi alike; without a guard this pipeline would run three
  times per bump. The root component's tag is the one guarded on,
  since it's the one that means "a deployment is described by a
  single number" regardless of how many apps eventually join the
  matrix. Its jobnik- prefix is stripped before use, so the
  resulting image/chart tag scheme is unchanged from before.

Also moved the carried-over "skip bot commits" step's use of
github.event.head_commit.message into an env var -- actionlint
flagged the direct interpolation as a script-injection risk on
untrusted input; behavior is unchanged.

Refs: .scratch/monorepo-migration/issues/09-manager-delivery-pipeline.md

Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com

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Coverage Report for apps/jobnik-manager

Status	Category	Percentage	Covered / Total
🟢	Lines	100% (🎯 80%)	767 / 767
🟢	Statements	100% (🎯 80%)	784 / 784
🟢	Functions	100% (🎯 80%)	112 / 112
🟢	Branches	100% (🎯 80%)	219 / 219

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