Make CreateGpgSignatureWorker backwards compatible with original method signature
Older versions of GitPushService
push a single commit SHA string to the queue,
but Gitaly requires that the parameters sent by CreateGpgSignatureWorker
are
an array. It's possible to have old workers using this original signature or
jobs in the retry queue that would fail if CreateGpgSignatureWorker
can't
handle the string form.
Edited by Stan Hu