First set Google cloud credentials file. File should be placed at project root and be named `terraform.json`
> travis encrypt-file terraform.json --add
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> travis encrypt LOGZ_TOKEN=<your_key> --add
> travis encrypt LOGZ_URL=<your_key> --add
> travis encrypt STATUSCAKE_APIKEY=<your_key> --add
> travis encrypt STATUSCAKE_USERNAME=<your_username> --add
> travis encrypt OPSGENIE_API_KEY=<your_key> --add