initial commit in fresh branch

.github/actions/update-cfn-templates/action.yml

@@ -0,0 +1,28 @@
+name: 'Update CFN Templates'
+description: 'Fetch cached CFN templates if unchanged, or generate updates ones'
+inputs:
+  custom-cdk-dir:
+    description: 'Custom CDK directory'
+    required: false
+    default: './cdk'
+runs:
+  using: 'composite'
+  steps:
+    - name: 'Checkout'
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 2
+
+    - name: 'Check for changes'
+      run: ./script/diff_cdk_dir.sh ${{ inputs.custom-cdk-dir }} ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }}
+      shell: bash
+
+    - name: 'Build new CFN templates'
+      if: ${{ env.CDK_CHANGES == 'true' }}
+      run: ./script/cfn.sh ${{ inputs.custom-cdk-dir }}
+      shell: bash
+
+    - name: 'Fetch cached CFN templates'
+      if: ${{ env.CDK_CHANGES == 'false' }}
+      run: echo "There are no CDK changes from main"
+      shell: bash

.github/workflows/test.yml

@@ -0,0 +1,19 @@
+name: Test
+on:
+  pull_request:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+jobs:
+  test-job:
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+      contents: read
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Use local action
+        uses: './.github/actions/update-cfn-templates'

cdk/bin/cdk.ts

@@ -95,3 +95,4 @@ new DiscountApi(app, 'discount-api-PROD', {
 	hostedZoneId: supportHostedZoneId,
 	certificateId: supportCertificateId,
 });
+

script/cfn.sh

@@ -3,9 +3,10 @@
 set -e
 set -x
 
+CDK_DIR=$1
 DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
 ROOT_DIR="${DIR}/.."
-cd "$ROOT_DIR/cdk"
+cd "$ROOT_DIR/$CDK_DIR"
 
 yarn install --frozen-lockfile
 yarn tsc

script/diff_cdk_dir.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+CDK_DIR=$1
+BASE=$2
+HEAD=$3
+
+git diff --quiet $BASE..$HEAD $CDK_DIR
+if [ $? -eq 0 ]; then
+  echo "CDK_CHANGES=false" >> $GITHUB_ENV
+else
+  echo "CDK_CHANGES=true" >> $GITHUB_ENV
+fi