message: Pass null keydir to load key from environment variable
diff: @@ -6,7 +6,7 @@ const log = require('@cardstack/logger')('cardstack/git-hyperledger');
  Change.prototype._makeCommit = async function(commitOpts) {
  let commit = await oldMakeCommit.call(this, commitOpts);
  - let gitchain = new Gitchain(this.repo.path(), process.env.HYPERLEDGER_KEY_PATH, {logger: log.info.bind(log)});
  + let gitchain = new Gitchain(this.repo.path(), null, {logger: log.info.bind(log)});
  try {
  await gitchain.push(commit.sha());
  