Docker 每次通过代码仓库构建镜像都会有之前的版本记录，是否需要处理？是否会影响速度？

 ========================================== [push stage begin.] Login Succeeded Login Succeeded The push refers to a repository [] 8b4c9516bf85: Preparing da1cca9ded2f: Preparing 9cdfb0b08ad0: Preparing 7c8f705798d0: Preparing db37ddccac7b: Preparing c9f127b3022f: Preparing 2082f40ef4c3: Preparing 9e1577120a86: Preparing 5e5a73bc1c84: Preparing 1ac4903a0b1b: Preparing 80a9a3a21b9e: Preparing 4a01b34e4618: Preparing f71516b3295c: Preparing 938ae8496137: Preparing b7931578fbc9: Preparing 45fd5fe2df5c: Preparing 1fb9b6a4d980: Preparing 4b1e5da9a3ad: Preparing 5628c4b4f617: Preparing a107741d0066: Preparing 6f098ed3c39c: Preparing 2f71b45e4e25: Preparing 938ae8496137: Waiting b7931578fbc9: Waiting 4b1e5da9a3ad: Waiting 45fd5fe2df5c: Waiting 5e5a73bc1c84: Waiting 1fb9b6a4d980: Waiting 1ac4903a0b1b: Waiting 80a9a3a21b9e: Waiting 4a01b34e4618: Waiting f71516b3295c: Waiting 5628c4b4f617: Waiting 6f098ed3c39c: Waiting 2f71b45e4e25: Waiting c9f127b3022f: Waiting a107741d0066: Waiting 2082f40ef4c3: Waiting 9e1577120a86: Waiting da1cca9ded2f: Pushed 8b4c9516bf85: Pushed 2082f40ef4c3: Layer already exists 9e1577120a86: Layer already exists 9cdfb0b08ad0: Pushed 5e5a73bc1c84: Layer already exists 1ac4903a0b1b: Layer already exists 80a9a3a21b9e: Layer already exists 4a01b34e4618: Layer already exists f71516b3295c: Layer already exists 938ae8496137: Layer already exists b7931578fbc9: Layer already exists 1fb9b6a4d980: Layer already exists 45fd5fe2df5c: Layer already exists 4b1e5da9a3ad: Layer already exists 5628c4b4f617: Layer already exists a107741d0066: Layer already exists 6f098ed3c39c: Layer already exists 2f71b45e4e25: Layer already exists 7c8f705798d0: Pushed db37ddccac7b: Pushed c9f127b3022f: Pushed latest: digest: sha256:e60fbc7d2988bcc8c353bfc2290798af421b691a941cf06be71f2490fc57ef27 size: 4919 [push successfuly.] 

多谢。