The package carries the install and upgrade scripts, built from src/ on prepack
(sql/ is not committed), with extensionSql(), upgradeScripts(), version and sqlDir.
Build the distribution from src/ (control, versioned SQL, META, MIT LICENSE,
PGXS Makefile, install README), checksum it, and sign an Ed25519 JWT manifest
(audience pgmorbac-release) with the verification public key attached to the
release. `npm run release` does it locally; the Drone pipeline does it on a
v* tag once the repo is Trusted with the pgmorbac_release_key + gitea_token
secrets.