* only push image if quay.io credentials are present

* fix command to be multi-line string

* flip backward test

* Add comment so circle will see the previous change

* only run gcp integration tests if secret key is available

* fix typo in config file

* Update rhel test to check for secret_key
Co-authored-by: Jerry Jackson <jerry@weave.works>
Co-authored-by: Mark Emeis <mark.emeis@weave.works>