Add jq to CI machines
Add jq to CI machines

jq is often used for JSON linting and parsing. As such it's useful to
have on CI machines where these are common tasks (also we want to use it
to lint JSON in the govuk-aws repo).

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet