internal: link to postgres setup doc if no DB

Change-Id: I2d8bef8f8961f148321d0f87cadf734441bc396b
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/238178
Reviewed-by: Julie Qiu <julie@golang.org>
diff --git a/internal/database/database_test.go b/internal/database/database_test.go
index 42d363f..fdba9aa 100644
--- a/internal/database/database_test.go
+++ b/internal/database/database_test.go
@@ -30,7 +30,7 @@
 
 	if err := dbtest.CreateDBIfNotExists(dbName); err != nil {
 		if errors.Is(err, derrors.NotFound) {
-			log.Printf("SKIPPING: could not connect to DB: %v", err)
+			log.Printf("SKIPPING: could not connect to DB (see doc/postgres.md to set up): %v", err)
 			return
 		}
 		log.Fatal(err)
diff --git a/internal/postgres/test_helper.go b/internal/postgres/test_helper.go
index 40e46ef..378bb7a 100644
--- a/internal/postgres/test_helper.go
+++ b/internal/postgres/test_helper.go
@@ -133,7 +133,7 @@
 	db, err := SetupTestDB(dbName)
 	if err != nil {
 		if errors.Is(err, derrors.NotFound) {
-			log.Printf("SKIPPING: could not connect to DB: %v", err)
+			log.Printf("SKIPPING: could not connect to DB (see doc/postgres.md to set up): %v", err)
 			return
 		}
 		log.Fatal(err)