エラーのためメモメモ
ec2-user:~/environment/app $ docker push 012345678901.dkr.ecr.us-east-1.amazonaws.com/hello-world:latest
The push refers to repository [012345678901.dkr.ecr.us-east-1.amazonaws.com/hello-world]
a600cfd4bd92: Retrying in 1 second
3f1a2f7da418: Retrying in 1 second
c5ae45af4700: Retrying in 1 second
746a97ae2d81: Retrying in 1 second
2d244e0816c6: Retrying in 1 second
df330540e954: Waiting
8a92cd794905: Waiting
b2c122fc6a0b: Waiting
EOF
aws ecr create-repository --region us-east-1
でリージョンを統一しよう