Add SHELL_EXIT_CODE variable to psql

When Who What
2023-04-06 21:33:53 Tom Lane (tgl) Closed in commitfest 2023-03 with status: Committed
2023-04-05 21:48:08 Tom Lane (tgl) New status: Needs review
2023-03-21 17:04:18 Tom Lane (tgl) Closed in commitfest 2023-03 with status: Committed
2023-03-21 17:01:09 Tom Lane (tgl) Added tgl as committer
2023-03-01 09:28:54 Maxim Orlov (m.orlov) New status: Ready for Committer
2023-01-31 02:44:25 vigneshwaran C (vignesh.postgres) Closed in commitfest 2023-01 with status: Moved to next CF
2022-12-28 10:39:03 Maxim Orlov (m.orlov) Added m.orlov as reviewer
2022-12-28 03:58:48 Justin Pryzby (justinpryzby) Changed authors to Corey Huinker (coreyh)
2022-12-21 05:35:37 Corey Huinker (coreyh) Attached mail thread CADkLM=cWao2x2f+UDw15W1JkVFr_bsxfstw=NGea7r9m4j-7rQ@mail.gmail.com
2022-12-21 05:35:37 Corey Huinker (coreyh) Created patch record