Add CI workflow for tip-of-stable PostgreSQL testing

[danolivo]

Existing CI (spockbench.yml, installcheck.yml, etc.) builds PostgreSQL from the latest released tag of each major version. That misses regressions that have already landed on the REL_*_STABLE branches but are not yet in a public minor release -- typically a 1-3 month window during which a real upgrade-to-stable user could hit a problem the spock test matrix never exercised.

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[codacy-production]

Up to standards ✅

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