cron-blue-green-deploy.yml

name: Cron Blue Green Deploy

# How can I use GitHub Actions with Vercel?
# https://vercel.com/guides/how-can-i-use-github-actions-with-vercel
env:
  VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
  VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}

on:
  # Allow manual runs
  workflow_dispatch:
    inputs:
      logLevel:
        description: "Log level"
        required: true
        default: "information"
        type: choice
        options:
          - information
          - debug
          - warning
          - critical
      tags:
        description: "Reason for running workflow?"
        required: true
        type: string
  # Run once every day https://crontab.guru/every-day
  schedule:
    - cron: "0 0 * * *"

jobs:
  create-blue-green-deployments:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          # `1` means fetch the latest commit without full history, so it's fast and efficient.
          fetch-depth: 1
      - name: Set node version
        uses: actions/setup-node@v3
        with:
          node-version-file: ".nvmrc"
      - name: Enable corepack
        run: corepack enable pnpm
      - name: Set pnpm version
        uses: pnpm/action-setup@v3
        with:
          run_install: false
          version: 8
      - name: Cache node_modules
        id: node-modules-cache
        uses: actions/cache@v3
        with:
          path: "**/node_modules"
          key: node-modules-cache-${{ hashFiles('**/pnpm-lock.yaml') }}
      - name: Install dependencies
        if: steps.node-modules-cache.outputs.cache-hit != 'true'
        run: pnpm install --no-frozen-lockfile
      - name: Install Vercel CLI
        run: npm install --global vercel
        # Pull down the production environment variables as if were building on Vercel.
        # https://vercel.com/docs/cli/pull
      - name: Get Vercel Environment Variables
        run: vercel pull --yes --environment=production --token=${{ secrets.VERCEL_TOKEN }}
        # Create a "blue" version of the site, deloy it, and capture the deployment url.
      - name: Update CSS to Blue
        run: 'echo "body {background: blue;}" > ./app/blue-green.css'
      - name: Build Blue
        run: vercel build --prod --token=${{ secrets.VERCEL_TOKEN }}
      - name: Deploy Blue
        id: deploy-blue
        run: echo "url=$(vercel deploy --prebuilt --prod --token=${{ secrets.VERCEL_TOKEN }})" >> $GITHUB_OUTPUT
        # Create a "green" version of the site, deloy it, and capture the deployment url.
      - name: Update CSS to Green
        run: 'echo "body {background: green;}" > ./app/blue-green.css'
      - name: Build Green
        run: vercel build --prod --token=${{ secrets.VERCEL_TOKEN }}
      - name: Deploy Green
        id: deploy-green
        run: echo "url=$(vercel deploy --prebuilt --prod --token=${{ secrets.VERCEL_TOKEN }})" >> $GITHUB_OUTPUT
      # Update the blue-green urls in the Edge Config store using Vercel's API.
      # https://vercel.com/docs/storage/edge-config/vercel-api#update-your-edge-config-items
      - name: Update Edge Config
        run: |
          curl -X 'PATCH' 'https://api.vercel.com/v1/edge-config/${{ secrets.VERCEL_EDGE_CONFIG_ID }}/items?teamId=${{ secrets.VERCEL_ORG_ID }}' \
          -H 'Authorization: Bearer ${{ secrets.VERCEL_TOKEN }}' \
          -H 'Content-Type: application/json' \
          -d $'{ "items": [ { "operation": "upsert", "key": "blue-green-configuration", "value": { "deploymentDomainBlue": "${{ steps.deploy-blue.outputs.url }}", "deploymentDomainGreen": "${{ steps.deploy-green.outputs.url }}", "trafficGreenPercent": 50 } } ] }'