When looking up a password, the AliasService should be able to consult the available set of environment variables as well as a remote source and the Gateway credential store.
TBD: How should the alias name be specified in the Gateway configuration to determine that the value is to be found using the environment variables.
- Specify the name as usual and have the AliasService check the environment first then perform the lookup as is done today
- Specify the name as usual and have the AliasService check the environment after performing the lookup as is done today
- Add some decoration to the alias name so that the AliasService knows to look only in the environment