[release] Ignore commit hooks

So this can be run in a git clone that has commit hooks
(e.g., for adding Gerrit change id) without adding garbage
to the commit log.

--
MOS_MIGRATED_REVID=104761737
diff --git a/scripts/release/release_test.sh b/scripts/release/release_test.sh
index 2d28c8f..deb8126 100755
--- a/scripts/release/release_test.sh
+++ b/scripts/release/release_test.sh
@@ -236,10 +236,16 @@
   expect_log "Baseline: 2464526"
   # Abandon it
   abandon v2
+  # Add a commit hook to test if it is ignored
+  cat <<'EOF' >.git/hooks/commit-msg
+echo HOOK-SHOULD-BE-IGNORED >>$1
+EOF
+  chmod +x .git/hooks/commit-msg
   # Re-create release
   create v2 2464526
   expect_log "Release v2"
   expect_log "Baseline: 2464526"
+  expect_not_log "HOOK-SHOULD-BE-IGNORED"
   # Push
   push
   # Abandon it