Latest Travis failure (Permission denied (publickey))

[asmeurer]

I'm not sure why Travis is failing now https://travis-ci.org/gforsyth/doctr/jobs/149058779

The error is

Build finished. The HTML pages are in _build/html.
Setting git attributes
git config --global user.name 'Travis docs builder (Travis CI)'
Adding doctr remote
git remote add doctr_remote git@github.com:gforsyth/doctr.git
Fetching doctr remote
git fetch doctr_remote
Warning: Permanently added the RSA host key for IP address '192.30.253.113' to the list of known hosts.
Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.

So something is wrong with the deploy ssh key. Maybe the stuff I'm putting in ~/.ssh/config, which was taken from https://github.com/alrra/travis-scripts/blob/master/doc/github-deploy-keys.md, is wrong. Other guides that I've seen use ssh-add. Do we need to use that. Is it the same?

@gforsyth can you verify that the deploy key is there on GitHub?

[gforsyth]

@asmeurer It's there. It does say that it's never been used

[gforsyth]

Fixed it! We need to start the ssh-agent and then also add the key to the agent. I made a bunch of dirty changes to figure out what was wrong, let me undo them and I'll put in a PR

[gforsyth]

Fixed in #44