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regenerate #4

	name: regenerate

	# Scheduled proof that the committed goldens are reproducible byte-for-byte
	# from the pinned oracle (libpg_query 18.0.0 via pg_query_go's wrapper, cgo).
	# This is the only place cgo ever runs; the main module never links it.

	on:
	schedule:
	- cron: "17 6 * * 1" # weekly, Monday 06:17 UTC
	workflow_dispatch:

	permissions:
	contents: read

	jobs:
	regenerate:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-go@v5
	with:
	go-version-file: go.mod
	- name: Install protoc (for the oracle's pg_query_go build)
	run: sudo apt-get update && sudo apt-get install -y protobuf-compiler
	- name: Fetch pinned corpus
	run: \|
	git clone --depth 1 --branch 18.0.0 https://github.com/pganalyze/libpg_query /tmp/libpg_query
	- name: Build the oracle's pg_query_go dependency
	# No pg_query_go release ships libpg_query 18 yet; this reproduces
	# pg_query_go's `make update_source` against the pinned tag.
	run: ./oracle/update-pg-query-go.sh /tmp/libpg_query
	- name: Regenerate goldens (builds the cgo oracle; several minutes)
	run: \|
	go run ./cmd/regenerate -libpg-query /tmp/libpg_query -pg-query-go oracle/pg_query_go
	- name: Goldens are reproducible
	run: git diff --exit-code -- parser/testdata