Re: [PATCH v2 22/24] midx: respect 'GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP'

Introduce a new 'GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP' environment
variable to also write a multi-pack bitmap when
'GIT_TEST_MULTI_PACK_INDEX' is set.

Signed-off-by: Taylor Blau <redacted>
---
 builtin/repack.c          | 13 ++++++++++---
 ci/run-build-and-tests.sh |  1 +
 midx.h                    |  2 ++
 t/README                  |  4 ++++
 4 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/builtin/repack.c b/builtin/repack.c
index 5f9bc74adc..77f6f03057 100644
--- a/builtin/repack.c
+++ b/builtin/repack.c

@@ -515,7 +515,10 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 		if (!(pack_everything & ALL_INTO_ONE) ||
 		    !is_bare_repository())
 			write_bitmaps = 0;
-	}
+	} else if (write_bitmaps &&
+		   git_env_bool(GIT_TEST_MULTI_PACK_INDEX, 0) &&
+		   git_env_bool(GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP, 0))
+		write_bitmaps = 0;