Generates a Google credential file based on Heroku Config Vars.
This is useful when using a package such as @google-cloud/storage which loads credentials from a file instead of an environmental variable.
- Create Config Vars key
GOOGLE_CREDENTIALSandGOOGLE_CONTENT_API_KEYpaste the content of service account credential JSON file as is. - There is no #2.
Config Var GOOGLE_APPLICATION_CREDENTIALS will be used to create google-credentials.json.
Config Var GOOGLE_CONTENT_API_KEY will be used to create content-api-key.json.
The script with generate a file called google-credentials.json and content-api-key.json which holds the key from the step #1 above.