Add missing function contains

Author: jeremiepozzigithub

services/convert/git_commit.go

@@ -73,6 +73,15 @@ func ToPayloadCommit(ctx context.Context, repo *repo_model.Repository, c *git.Co
 	}
 }
 
+func contains(a []string, s string) bool {
+	for _, v := range a {
+		if v == s {
+			return true
+		}
+	}
+	return false
+}
+
 type ToCommitOptions struct {
 	Stat         bool
 	Verification bool