Default AWS region

[axel3rd]

Hi,

When this plugin (thx for it 😗 !) is used "as it" (just upload it) in TeamCity 2022.04.4, any build using this build feature fails with:

Unable to load region from any of the providers in the chain software.amazon.awssdk.regions.providers.DefaultAwsRegionProviderChain@62501254: [software.amazon.awssdk.regions.providers.SystemSettingsRegionProvider@6ee21c83: Unable to load region from system settings. Region must be specified either via environment variable (AWS_REGION) or  system property (aws.region)., software.amazon.awssdk.regions.providers.AwsProfileRegionProvider@422105e7: No region provided in profile: default, software.amazon.awssdk.regions.providers.InstanceProfileRegionProvider@2e25e758: Unable to contact EC2 metadata service.]

Although the AWS region seems not really important for aws sts assume-role (The AccessKey/Role could be defined in another region that the given), it seems required for AWS API endpoint reachability.

Adding the AWS region as Java system property (TEAMCITY_SERVER_OPTS=-Daws.region=eu-west-3) solves the problem ; But adding some "server parameters/environment" for a plugin usage is perhaps not a nice way.

=> Adding a new Region: option (at the end of list) with us-east-1 as default could perhaps a good idea ?

Otherwise, supporting parameters coming from config/internal.properties would perhaps a better solution if this kind of new option would be considered as not relevant.

I can provide a PR, but I would like some feelings about the most sustainable way.

Thanks in advance