add testing/pgruntime

Testing pgruntime has quickly turned out to be a nightmare, because so
many parts of the test logic are not easily reproducible (e.g.
`stopDBIfLingering`). I decided to not waste a bunch of time testing
code that is relatively compact and easy to verify by careful
examination, and that is unlikely to change a lot in the future.

1 files changed, 1 insertions, 0 deletions

diff --git a/go.work b/go.work
index c163e32..1d7d7f0 100644
--- a/go.work
+++ b/go.work
@@ -3,4 +3,5 @@ go 1.26
 use (
 	.
 	./benchmark
+	./testing
 )