Обсуждение: pgsql: Fix two issues with recently-introduced nbtree test

Fix two issues with recently-introduced nbtree test

REGRESS has forgotten about the test nbtree_half_dead_pages, and a
.gitignore was missing from the module.

Oversights in c085aab27819 for REGRESS and 1e4e5783e7d7 for the missing
.gitignore.

Discussion: https://postgr.es/m/aTipJA1Y1zVSmH3H@paquier.xyz

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/06817fc8a4b739cc2d1aa87071d9e20d483fd678

Modified Files
--------------
src/test/modules/nbtree/.gitignore | 4 ++++
src/test/modules/nbtree/Makefile   | 3 ++-
2 files changed, 6 insertions(+), 1 deletion(-)