Remove DLPATH manipulation from TimescaleDB build scripts (#10289)

This looks like a workaround for a missing "make install-tests" call
when installing Postgres.

Author: akuzm

.github/workflows/linux-build-and-test.yaml

@@ -158,6 +158,7 @@ jobs:
         for ext in ${{ matrix.pg_extensions }}; do
           make -C contrib/${ext} install
         done
+        make install-tests
         echo "$HOME/$PG_INSTALL_DIR/bin" >> "${GITHUB_PATH}"
 
     - name: Upload config.log

test/pgtest/CMakeLists.txt

@@ -56,11 +56,8 @@ endforeach(IGNORE_TEST)
 # Write the final test schedule
 file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/schedule ${PG_TEST_SCHEDULE})
 
-# Need --dlpath set to PostgreSQL's test directory so that the tests can load
-# libraries there
-set(PG_REGRESS_OPTS_PGTEST
-    --schedule=${CMAKE_CURRENT_BINARY_DIR}/schedule
-    --load-extension=timescaledb --dlpath=${PG_REGRESS_DIR})
+set(PG_REGRESS_OPTS_PGTEST --schedule=${CMAKE_CURRENT_BINARY_DIR}/schedule
+                           --load-extension=timescaledb)
 
 add_custom_target(
   pginstallcheck

test/test-defs.cmake

@@ -72,7 +72,7 @@ file(
   NO_SOURCE_PERMISSIONS
   FILE_PERMISSIONS OWNER_READ OWNER_WRITE)
 
-set(PG_REGRESS_OPTS_BASE --dlpath=${PROJECT_BINARY_DIR}/src)
+set(PG_REGRESS_OPTS_BASE)
 
 set(PG_REGRESS_OPTS_EXTRA
     --create-role=${TEST_ROLE_SUPERUSER},${TEST_ROLE_DEFAULT_PERM_USER},${TEST_ROLE_DEFAULT_PERM_USER_2},${TEST_ROLE_1},${TEST_ROLE_2},${TEST_ROLE_3},${TEST_ROLE_4},${TEST_ROLE_READ_ONLY}