Problems with `arc` and `phabricator`

[Iavor Diatchki]

Hello,

I just fixed a small bug in GHC (#11406) and I'm trying to push the change
to `phabricator` for review, but the command is failing.  Here is my
output, could you please advise on what to do?

> arc diff
Linting...
 LINT OKAY  No lint problems.
Running unit tests...
No unit test engine is configured for this project.
 PUSH STAGING  Pushing changes to staging area...
Permission denied (publickey,keyboard-interactive).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
 STAGING FAILED  Unable to push changes to the staging area.
Usage Exception: Failed to push changes to staging area. Correct the issue,
or use --skip-staging to skip this step.

Clearly, there is some sort of permission issue...

-Iavor
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