ecrLogin: support setting registry ids explicitly

[alexey-pelykh]

• Please check if the PR fulfills these requirements

• The commit message describes your change
• Tests for the changes have been added if possible (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• Changes are mentioned in the changelog (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Support of non-default AWS account for ECR login

• What is the current behavior? (You can also link to an open issue here)

ECR login is performed into default AWS account

• What is the new behavior (if this is a feature change)?

ECR login is performed into specified AWS account, or default one if not specified

• Does this PR introduce a breaking change? (What changes might users need to make in their setup due to this PR?)

No

• Other information:

[hoegertn]

Thanks for the change. Can you please adjust the documentation and add the feature to the changelog.

[alexey-pelykh]

@hoegertn I hope I did that right :)

[hoegertn]

Please rebase on master. The Update branch button does not work for me.

[alexey-pelykh]

Done 👍