update client to support direct env var credentials for fargate compatibility #138
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🗒️ Summary
This is an attempt to add Fargate compatibility to sweepers' IAM auth. Fargate doesn't have an equivalent service to the EC2 metadata service. I've seen mention that it injects credentials directly using the standard environment variables, but I've been unable to find mention of this in AWS documentation.
Given the stakes and the desire to ensure that everything is 1:1 with the deployment setup, the plan is to merge, test, and revert this PR if unsuccessful.