Helpful Make target to login to public ECR. (#2934)

Makefile

@@ -391,6 +391,9 @@ cleanup-ec2-sdk-override:
 	    ./scripts/ec2_model_override/cleanup.sh ; \
 	fi
 
+ecr-public-login:
+	aws ecr-public get-login-password --region us-east-1 | docker login --username AWS --password-stdin public.ecr.aws
+
 ##@ Cleanup
 
 # Clean temporary files and build artifacts from the project.