I have a repository in GitLab (Lambda Functions) and want to work with the AWS CDK pipeline (https://aws.amazon.com/blogs/developer/cdk-pipelines-continuous-delivery-for-aws-cdk-applications) to develop CI/CD pipeline. In AWS CDK docs there is nowhere mention about Gitlab. Will really appreciate it if someone can confirm this.
Only Bitbucket, GitHub, GitHub Enterprise Server actions are supported natively with codepipelines at the moment. You will need a custom lambda for gitlab. https://aws.amazon.com/quickstart/architecture/git-to-s3-using-webhooks/ can help you with that.
You can use s3 source actions after implementing up git to s3 logic