How to build containers with the AWS Fargate Custom Executor for GitLab Runner and AWS CodeBuild

AWS Fargate does not support containers running in privileged mode, which complicates the use of Docker-in-Docker (DinD) for building and running container images within GitLab Runner's CI/CD pipelines. However, a cloud-native solution is proposed by integrating AWS CodeBuild to build containers, circumventing the limitations of Fargate. Detailed instructions are provided for setting up and configuring GitLab Runner to run on AWS Fargate, including using AWS CodeBuild to handle the container build process. The process involves creating an S3 bucket and a CodeBuild project, configuring CI containers with necessary AWS CLI tools, and setting up AWS IAM permissions for managing resources like S3, CodeBuild, and CloudWatch Logs. By adding a buildspec.yml file and a custom script, codebuild.sh, to the GitLab repository, users can trigger CodeBuild jobs that fetch build files from S3, execute build processes using Docker, and log outputs. This integration allows GitLab CI to scale efficiently on AWS Fargate while leveraging AWS services to manage container builds without requiring privileged mode.

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