Recently I wanted to test a module that required an API key and wanted to use Travis CI to do so. You can use the Travis CI Client to encrypt the key and make it an environment variable for Travis CI to use.
travis encrypt 'KEY_NAME_WHICH_WILL_BE_THE_ENV_NAME=someapikeythatyouwanttoprotect' --add
This will generate some encrypted hash and the add flag will automatically put
this in your Travis CI yml file.
You also need to expose that environment variable to your application from your Travis CI File. You can do that like so:
script:
- export KEY_NAME_WHICH_WILL_BE_THE_ENV_NAME=$KEY_NAME_WHICH_WILL_BE_THE_ENV_NAME
For my use case I needed to use it in a python file, and was able to do so by
KEY = os.environ['KEY_NAME_WHICH_WILL_BE_THE_ENV_NAME']