run just the flaky test in CI, ten times

.github/workflows/build_and_test.yml

@@ -447,6 +447,7 @@ jobs:
         with:
           build_type: ${{ matrix.build_type }}
           test_selection: regress
+          extra_params: -k test_vm_bit_clear_on_heap_lock_blackbox
           needs_postgres_source: true
           run_with_real_s3: true
           real_s3_bucket: neon-github-ci-tests
@@ -858,7 +859,7 @@ jobs:
           cache-to: type=registry,ref=neondatabase/compute-node-${{ matrix.version }}:cache-${{ matrix.arch }},mode=max
           tags: |
             neondatabase/compute-node-${{ matrix.version }}:${{ needs.tag.outputs.build-tag }}-${{ matrix.arch }}
-      
+
       - name: Build neon extensions test image
         if: matrix.version == 'v16'
         uses: docker/build-push-action@v5

test_runner/regress/test_vm_bits.py

@@ -1,6 +1,7 @@
 import time
 from contextlib import closing
 
+import pytest
 from fixtures.log_helper import log
 from fixtures.neon_fixtures import NeonEnv, NeonEnvBuilder, fork_at_current_lsn
 from fixtures.utils import query_scalar
@@ -193,6 +194,7 @@ def test_vm_bit_clear_on_heap_lock_whitebox(neon_env_builder: NeonEnvBuilder):
     assert vm_page_at_pageserver == vm_page_in_cache
 
 
+@pytest.mark.repeat(10)
 def test_vm_bit_clear_on_heap_lock_blackbox(neon_env_builder: NeonEnvBuilder):
     """
     The previous test is enough to verify the bug that was fixed in