Re-enable ECR image publishing

Arran Walkerrequested to merge
ajwalker/reenable-ecr into main

What does this MR do?

Restores ECR pushing.

Why was this MR needed?

!3514 (merged) disabled ECR pushing.

What's the best way to test this MR?

What are the relevant issue numbers?

Edited by Arran Walker

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