Run pginstallcheck in parallel with main installcheck (#10214)

Use the newly added "parallel" GitHub Actions annotations for steps.
This can save about 40 seconds.

Author: akuzm

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

@@ -204,8 +204,14 @@ jobs:
             build/compile_commands.json
 
     - name: Check exported symbols
+      background: true
       run: ./build/scripts/export_prefix_check.sh
 
+    - name: pginstallcheck
+      background: true
+      if: matrix.pginstallcheck
+      run: make -C build pginstallcheck
+
     - name: make installcheck
       if: matrix.installcheck
       run: |
@@ -214,9 +220,8 @@ jobs:
             SKIPS="${{ join(matrix.skipped_tests, ' ') }}" ${{ matrix.installcheck_args }} \
             | tee installcheck.log
 
-    - name: pginstallcheck
-      if: matrix.pginstallcheck
-      run: make -C build pginstallcheck
+    - name: Wait for checks to finish
+      wait-all:
 
     - name: coverage
       if: matrix.coverage

test/test-defs.cmake

@@ -105,7 +105,7 @@ set(PG_REGRESS_OPTS_TEMP_INSTANCE
     --temp-config=${TEST_OUTPUT_DIR}/postgresql.conf)
 
 set(PG_REGRESS_OPTS_TEMP_INSTANCE_PGTEST
-    --temp-instance=${TEST_CLUSTER}
+    --temp-instance=${TEST_CLUSTER}-pg
     --temp-config=${TEST_OUTPUT_DIR}/pgtest.conf)
 
 set(PG_REGRESS_OPTS_LOCAL_INSTANCE --host=${TEST_PGHOST}