Support environment variables

[DmitriyLyalyuev]

Feature Request

Please make a support of env vars as many other software:

• AWS_ACCESS_KEY_ID
• AWS_SECRET_ACCESS_KEY
• AWS_REGION

Are you willing to resolve this issue by submitting a Pull Request?

• Yes, I have the time, and I know how to start.
• Yes, I have the time, but I don't know how to start. I would need guidance.
• No, I don't have the time, although I believe I could do it if I had the time...
• No, I don't have the time and I wouldn't even know how to start.

[console6500]

Another one to consider is:

• AWS_PROFILE

to identify the profile to use.

[gregtrotter]

Echoing this request. We use a third party authentication system which means that our .aws/config and credential files don't have anything useful, it passes the info on exclusively via environment variables.