是的，AWS ECR提供了自动构建Docker镜像的选项。您可以使用AWS CodeBuild来创建构建规范，然后将其与ECR集成。

以下是一个使用AWS CLI创建自动构建Docker镜像的示例：

1. 首先，使用AWS CLI创建一个CodeBuild构建规范文件（例如buildspec.yml），定义您的构建步骤和要执行的命令。例如，以下是一个简单的构建规范示例：

version: 0.2
phases:
  install:
    runtime-versions:
      docker: 19
  build:
    commands:
      - echo "Building Docker image"
      - docker build -t your-image-name .
      - echo "Tagging Docker image"
      - docker tag your-image-name:latest your-ecr-repository-url:latest
      - echo "Pushing Docker image to ECR"
      - docker push your-ecr-repository-url:latest

2. 创建一个ECR存储库，用于存储您的Docker镜像。

aws ecr create-repository --repository-name your-repository-name

3. 创建一个CodeBuild项目，并将构建规范文件与项目集成。

aws codebuild create-project --name your-project-name --source type=NO_SOURCE --environment type=LINUX_CONTAINER,image=aws/codebuild/standard:4.0 --service-role your-service-role-arn --artifacts type=NO_ARTIFACTS --logs-config status=ENABLED

4. 将构建规范文件与CodeBuild项目关联。

aws codebuild update-project --name your-project-name --source type=CODEPIPELINE --source-buildspec buildspec.yml

5. 创建一个CodePipeline管道，将CodeBuild项目与ECR存储库集成。

aws codepipeline create-pipeline --pipeline-name your-pipeline-name --role-arn your-role-arn --cli-input-json file://pipeline.json

其中，pipeline.json是包含以下内容的JSON文件：

{
  "name": "your-pipeline-name",
  "roleArn": "your-role-arn",
  "artifactStore": {
    "type": "S3",
    "location": "your-s3-bucket"
  },
  "stages": [
    {
      "name": "Source",
      "actions": [
        {
          "name": "Source",
          "actionTypeId": {
            "category": "Source",
            "owner": "AWS",
            "provider": "CodeCommit",
            "version": "1"
          },
          "configuration": {
            "RepositoryName": "your-codecommit-repository-name",
            "BranchName": "your-codecommit-branch-name"
          },
          "outputArtifacts": [
            {
              "name": "SourceOutput"
            }
          ],
          "runOrder": 1
        }
      ]
    },
    {
      "name": "Build",
      "actions": [
        {
          "name": "Build",
          "actionTypeId": {
            "category": "Build",
            "owner": "AWS",
            "provider": "CodeBuild",
            "version": "1"
          },
          "configuration": {
            "ProjectName": "your-codebuild-project-name"
          },
          "inputArtifacts": [
            {
              "name": "SourceOutput"
            }
          ],
          "outputArtifacts": [
            {
              "name": "BuildOutput"
            }
          ],
          "runOrder": 1
        }
      ]
    },
    {
      "name": "Deploy",
      "actions": [
        {
          "name": "Deploy",
          "actionTypeId": {
            "category": "Deploy",
            "owner": "AWS",
            "provider": "ECR",
            "version": "1"
          },
          "configuration": {
            "RepositoryName": "your-ecr-repository-name"
          },
          "inputArtifacts": [
            {
              "name": "BuildOutput"
            }
          ],
          "runOrder": 1
        }
      ]
    }
  ]
}

6. 更新CodeBuild项目的服务角色，以允许CodeBuild访问ECR存储库。

aws codebuild update-project --name your-project-name --service-role your-service-role-arn

完成上述步骤后，您的代码更改将触发自动构建和部署到ECR