Add role-arn param for ecr-login

[bdehamer]

Checklist

• All new jobs, commands, executors, parameters have descriptions
• Examples have been added for any significant new features
• README has been updated, if necessary

Motivation, issues

Adds a role-arn parameter to the ecr-login command to support STS role-assumption. This param is already supported in the setup command of the circleci/aws-cli orb it simply hasn't been exposed as part of ecr-login yet.

#158

Description

Add role-arn parameter to ecr-login command which is then passed to the aws-cli/setup command.

Add role-arn parameter to the build-image command which is then passed to the ecr-login command.

Add role-arn parameter to the build-and-push-image command which is then passed to the ecr-login command.

Add role-arn parameter to the build-and-push-image job which is then passed to the build-and-push-image command.

[m477r1x]

We are in desperate need of this, any change we can get this merged and release to the orb?

[brivu]

Hey Cal!

This PR has been addressed and merged in this PR: #172

Cheers!
Brian