CI failure at "Checkout code" step - fatal: Could not read from remote repository.

[Rob--W]

https://app.circleci.com/pipelines/github/mozilla/FirefoxColor/1087/workflows/8f5362d6-3b2b-498f-8fab-e4ba07ea3820/jobs/2787

Here is the end of the log:

Using SSH Config Dir '/home/circleci/.ssh'
git version 2.34.1
Cloning git repository
Cloning into '.'...
Warning: Permanently added the ECDSA host key for IP address '140.82.113.4' to the list of known hosts.
[email protected]: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

exit status 128

CircleCI received exit code 128

For the record, [email protected]:mozilla/FirefoxColor.git and as part of the checkout the following logic is run:

export GIT_SSH_COMMAND='ssh -i "$SSH_CONFIG_DIR/id_rsa" -o UserKnownHostsFile="$SSH_CONFIG_DIR/known_hosts"'

# use git+ssh instead of https
git config --global url."ssh://[email protected]".insteadOf "https://github.com" || true
git config --global gc.auto 0 || true

if [ -e '/home/circleci/FirefoxColor/.git' ] ; then
  echo 'Fetching into existing repository'
  existing_repo='true'
  cd '/home/circleci/FirefoxColor'
  git remote set-url origin "$CIRCLE_REPOSITORY_URL" || true
else
  echo 'Cloning git repository'
  existing_repo='false'
  mkdir -p '/home/circleci/FirefoxColor'
  cd '/home/circleci/FirefoxColor'
  git clone --no-checkout "$CIRCLE_REPOSITORY_URL" .
fi

[diox]

Do you have a Deploy Key set up in CircleCI, and authorized with GitHub for this repo?