Fix for region discovery issue with aws sdkv2 when running in ec2 #2977
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Description
The new KMS signing support uses aws sdkv2, this automatically discovers region from environment or local configuration files, however it doesn't automatically use imds. This code replicates the v1 local configuration preference with fall back to imds service.
Context
Changes
Testing
go test ./...
). Buildkite employees may check this if the pipeline has run automatically.go fmt ./...
)