Fix gallery zip scan context (#3433)

* fix zip scan context
* move ValueOnlyContext to utils, use it for zipCtx

pkg/file/scan.go

@@ -14,6 +14,7 @@ import (
 	"github.com/remeh/sizedwaitgroup"
 	"github.com/stashapp/stash/pkg/logger"
 	"github.com/stashapp/stash/pkg/txn"
+	"github.com/stashapp/stash/pkg/utils"
 )
 
 const (
@@ -574,7 +575,7 @@ func (s *scanJob) handleFile(ctx context.Context, f scanFile) error {
 		// scan zip files with a different context that is not cancellable
 		// cancelling while scanning zip file contents results in the scan
 		// contents being partially completed
-		zipCtx := context.Background()
+		zipCtx := utils.ValueOnlyContext{Context: ctx}
 
 		if err := s.scanZipFile(zipCtx, f); err != nil {
 			logger.Errorf("Error scanning zip file %q: %v", f.Path, err)