Based off of these code bases:

• https://github.com/youyo/aws-cdk-github-actions
• https://github.com/charlesdotfish/dotnet-cdk-action
• https://github.com/two4suited/aws-cdk-dotnet-github-action

.NET CDK GitHub Action

This GitHub action executes a command using the CDK CLI, from within a .NET SDK Docker container, and provides the output of the command as an action output. A subset of the AWS CLI supported environment variables may be used to configure the credentials used by the CDK CLI (those being AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY and AWS_DEFAULT_REGION).

Usage

Inputs

• cdk_subcommand: The cdk subcommand to execute. e.g. synth
• cdk_stack: The cdk stack name to execute command on.
• cdk_args: The arguments that should be passed in after cdk <cdk_subcommand>.
• working_dir: The working directory of the cdk project. Should be the root of cdk.json. Default: .
• actions_comment: Enable pull request comments. Default true
• debug_log: Enable debug logging. Default false

Outputs

• status_code: The returned status code of the cdk command.
• json: json representation of outputs from cloudformation stacks in format of { "StackName" : { "OutputName" : "OutputValue" } }
• ${stack_name}-${output_name}: output from cloudformation stack in format of ${stack_name}-${output_name}

Env

• AWS_ACCESS_KEY_ID Required
• AWS_SECRET_ACCESS_KEY Required
• GITHUB_TOKEN Required for actions_comment=true

Recommended to get AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY from secrets. A github token is automatically made available as a secret as GITHUB_TOKEN.

Examples

name: Pull Request

on:
  pull_request:
    branches:
      - main

jobs:
  diff:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Build cloud artifact
        uses: altavec/dotnet-cdk-action@v1
        with:
          cdk_subcommand: diff
          actions_comment: true
        env:
          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

name: Build & Deploy

on:
  push:
    branches:
      - main

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Build cloud artifact
        uses: altavec/dotnet-cdk-action@v1
        with:
          cdk_subcommand: synth
          actions_comment: false
        env:
          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
          AWS_DEFAULT_REGION: ap-southeast-2

      - name: Pack cloud artifact
        run: |
          zip -r cdk.zip ./cdk.out/**
      
      - name: Upload cloud artifact
        uses: actions/upload-artifact@v1
        with:
          name: cdk.zip
          path: cdk.zip
    
  deploy:
    runs-on: ubuntu-latest
    steps:
      - name: Download cloud artifact
        uses: actions/download-artifact@v4
        with:
          name: cdk.zip

      - name: Unpack cloud artifact
        run: |
          unzip cdk.zip
      
      - name: Deploy cloud artifact
        uses: altavec/dotnet-cdk-action@v1
        with:
          cdk_subcommand: deploy
          cdk_args: --app cdk.out --require-approval never
          actions_comment: false
        env:
          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
          AWS_DEFAULT_REGION: ap-southeast-2