Add in-repo release workflow and spock50 RPM/DEB packaging

[maqeel75]

Summary

Adds an in-repo release pipeline for the v5 series, so Spock's RPMs and DEBs are
built from this repo on a tag push instead of out of pgedge-enterprise-packages.
Packaging files are taken from that repo's spock50/ component; the workflow
follows the pgedge-postgres-mcp / pgedge-rag-server shape.

.github/workflows/release.yml — 7 jobs:
detect-matrix → determine-repo-type → package-rpm/package-deb → push-dnf/push-apt → publish-manifest
across almalinux 9/10 and jammy/noble/resolute/bullseye/bookworm/trixie, amd64 + arm64.

Notable choices

• Per-PG fan-out. PER_PG_VERSION=true, but this repo has no postgresql-N/
  dirs, so the PG list can't be auto-discovered — passed explicitly, default
  16,17,18, overridable per run. Artifact names carry the PG major so the three
  PG cells of one (os, arch) don't collide.
• COMPONENT_NAME=spock50, not the repo name, so v5 and v6 never share an S3
  backup path or _pending/ manifest key.
• Source from the checkout, not a clone: each cell git archives into
  release-artifacts/, which the build scripts prefer over cloning the tag.
  Packages are the exact commit under test, and simulate_tag branch runs work.
• Guards: tag filter v5.* plus an assert that include/spock.h
SPOCK_VERSION equals the tag version and is 5.x.
• DEB pre-release ordering fixed (spock50 lacked it): 5.0.11~rc1-1.noble
  now sorts below 5.0.11-1.noble.
• Dropped debian/patches/ — pkglibdir.patch targets a
  spock_create_subscriber recipe that no longer exists and does not apply.

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[codacy-production]

Up to standards ✅

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[danolivo]

The same as for PR#550. Basically, looks good