ci: add PG18 to test matrix; skip test job for doc-only PRs#37

jnasbyupgrade merged 2 commits into

Postgres-Extensions:masterPostgres-Extensions/pgxntool-test:masterfrom

jnasbyupgrade:doc-only-ci-bypassjnasbyupgrade/pgxntool-test:doc-only-ci-bypassCopy head branch name to clipboard