ci: create deploy pipeline

[Malanius]

This pull request introduces a GitHub Actions-based deployment pipeline for AWS CDK, along with supporting changes to the infrastructure code and development environment configuration. The most important changes include adding workflows for deployment, creating a new GitHubDeploy stack for permissions management, and updating the application stage to conditionally include the deployment stack in production.

Deployment Pipeline Setup:

• .github/workflows/deploy.yaml: Added a new GitHub Actions workflow to automate the deployment of CDK stacks. This includes a diff job to preview changes and a deploy job to apply them to the production environment.
• .github/workflows/prepare.yaml: Added a reusable composite action to set up the Node.js environment, install pnpm, and install project dependencies.

Infrastructure Code Updates:

• src/deploy/github-deploy.stack.ts: Introduced a new GitHubDeploy stack to manage AWS IAM roles and permissions required for GitHub Actions to deploy CDK stacks. This includes policies for CloudFormation, S3, ECR, and SSM.
• src/app-stage.ts: Updated the AppStage class to include the GitHubDeploy stack in the production environment. Added dependencies between stacks to ensure proper deployment order. [1] [2]

Development Environment Configuration:

• .vscode/settings.json: Configured Prettier as the default formatter for GitHub Actions workflow files to ensure consistent formatting.

[Copilot]

Pull Request Overview

This pull request adds a GitHub Actions deployment pipeline that leverages AWS CDK along with infrastructure code updates to support a new GitHubDeploy stack for managing deployment permissions.

• Introduces GitHub Actions workflows for diffing and deploying CDK stacks.
• Adds a new GitHubDeploy stack for IAM role and policy setup for GitHub Actions.
• Updates the AppStage to conditionally include the GitHubDeploy stack in production and sets up stack dependencies.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/deploy/github-deploy.stack.ts	Adds GitHubDeploy stack with IAM roles and policies for CDK deployments.
src/app-stage.ts	Updates AppStage to instantiate GitHubDeploy conditionally and establishes dependencies.
.vscode/settings.json	Configures the default formatter for GitHub Actions workflow files.
.github/workflows/prepare.yaml	Provides a composite action to set up the Node.js environment and install dependencies.
.github/workflows/deploy.yaml	Implements workflows for diffing and deploying the CDK stacks.

Comments suppressed due to low confidence (1)

src/app-stage.ts:17

• If core or related stacks depend on resources from GitHubDeploy, consider explicitly adding dependencies (using addDependency) between them to enforce the correct deployment order.

if (appStage === 'prod') {