manifest.js.gz: avoid long-lived per-epoch cat-file processes

When generating per-inbox manifests, we were forgetting to
cleanup per-epoch "git cat-file --batch" processes.  Our
previous method of generating modified times was also stupidly
inefficient, so replace the pipeline with a single
"git for-each-ref" invocation.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/PublicInbox/ManifestJsGz.pm b/lib/PublicInbox/ManifestJsGz.pm
index 69d81fa1..cde60245 100644
--- a/lib/PublicInbox/ManifestJsGz.pm
+++ b/lib/PublicInbox/ManifestJsGz.pm
@@ -27,7 +27,7 @@ sub inject_entry ($$$;$) {
         $ctx->{manifest}->{$url_path} = $ent;
 }
 
-sub manifest_add ($$;$$) { # slow path w/o extindex "all"
+sub manifest_add ($$;$$) { # slow path w/o extindex "all" (or per-inbox)
         my ($ctx, $ibx, $epoch, $default_desc) = @_;
         my $url_path = "/$ibx->{name}";
         my $git;