feat(imagebuilder-alpha): add support for Workflow Construct

[tarunb12]

Issue

aws/aws-cdk-rfcs#789

Reason for this change

This change adds a new alpha module for EC2 Image Builder L2 Constructs (@aws-cdk/aws-imagebuilder-alpha), as outlined in aws/aws-cdk-rfcs#789. This PR specifically implements the Workflow construct.

Description of changes

This change implements the Workflow construct, which is a higher-level construct of CfnWorkflow.

Example

const workflow = new imagebuilder.Workflow(this, 'Workflow', {
  workflowName: 'custom-build-workflow',
  workflowType: imagebuilder.WorkflowType.BUILD,
  workflowVersion: '1.0.0',
  description: 'A test workflow',
  changeDescription: 'Initial version',
  kmsKey: kms.Key.fromLookup(this, 'WorkflowKey', { aliasName: 'alias/workflow-encryption-key' }),
  // Workflow to create an AMI from an existing EC2 instance
  data: imagebuilder.WorkflowData.fromJsonObject({
    name: 'custom-build-workflow',
    description: 'Workflow to build an AMI from an EC2 instance',
    schemaVersion: imagebuilder.WorkflowSchemaVersion.V1_0,
    parameters: [
      {
        name: 'instanceId',
        type: imagebuilder.WorkflowParameterType.STRING
      }
    ],
    steps: [
      {
        name: 'CreateOutputAMI',
        action: imagebuilder.WorkflowAction.CREATE_IMAGE,
        onFailure: imagebuilder.WorkflowOnFailure.ABORT,
        inputs: { 'instanceId': 'i-123' }
      },
      {
        name: 'TerminateBuildInstance',
        action: imagebuilder.WorkflowAction.TERMINATE_INSTANCE,
        onFailure: imagebuilder.WorkflowOnFailure.CONTINUE,
        inputs: { 'instanceId': 'i-123' }
      }
    ],
    outputs: [{ name: 'ImageId', value: 'ami-123' }]
  })
});

Describe any new or updated permissions being added

N/A - new L2 construct in alpha module

Description of how you validated changes

Validated with unit tests and integration tests. Manually verified generated CFN templates as well.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[ozelalisen]

This is the first round of comments

Pull request has been modified.

Pull request has been modified.

[aws-cdk-automation]

➡️ PR build request submitted to test-main-pipeline ⬅️

A maintainer must now check the pipeline and add the pr-linter/cli-integ-tested label once the pipeline succeeds.

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[ozelalisen]

@Mergifyio requeue

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