extended logging of aws authorization error

[amanenk]

fixes #245

[roneli]

LGTM, minor changes, would also ask @yevgenypats to review the message if its clearer now

[yevgenypats]

Looks good. One question :

What about if it’s not in an environment variable but just in ~/.aws/credentials ?

[amanenk]

Looks good. One question :

What about if it’s not in an environment variable but just in ~/.aws/credentials ?

there is an creds.Source that tell which authorization way is used.
here is an example of message below with authorization soruce: SharedConfigCredentials: C:\\Users\\user\\.aws\\credentials

{"level":"error","alias":"aws","provider":"aws","version":"unmanaged","error":"rpc error: code = Unknown desc = failed to create aws client for account default. AWS Error: operation error STS: GetCallerIdentity, https response error StatusCode: 403, RequestID: 388b55a6-781e-41fe-bef5-15b0e1121cac, api error SignatureDoesNotMatch: The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details., authorization soruce: SharedConfigCredentials: C:\\Users\\user\\.aws\\credentials, detected aws env variables: AWS_PROFILE","time":"2021-12-13T16:23:34+02:00","message":"failed to configure provider"}

[roneli]

LGTM

review fixed