Setup initial CI and CD workflow files (#41)

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v2
+      with:
+        node-version: '20'
+
+    - name: Install dependencies
+      run: npm install
+
+    - name: Run tests
+      run: npm test
+
+    - name: Build application
+      run: npm run build

.github/workflows/deploy-live.yml

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+name: Live Deployment
+
+on:
+  push:
+    branches:
+      - main
+      - staging
+
+env:
+  VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
+  VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}
+
+jobs:
+  deploy-preproduction-preview:
+    uses: ./.github/workflows/deploy.yml
+    if: github.ref_name == 'staging'
+    with:
+      environment: preproduction
+      preview: false
+    secrets: inherit
+  deploy-production-preview:
+    uses: ./.github/workflows/deploy.yml
+    if: github.ref_name == 'main'
+    with:
+      environment: production
+      preview: false
+    secrets: inherit
+

.github/workflows/deploy-preview.yml

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+name: Preview Deployment
+
+on:
+  pull_request:
+    branches:
+      - main
+      - staging
+
+env:
+  VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
+  VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}
+
+jobs:
+  deploy-preproduction-preview:
+    uses: ./.github/workflows/deploy.yml
+    if: github.base_ref == 'staging'
+    with:
+      environment: preproduction
+      preview: true
+    secrets: inherit
+  deploy-production-preview:
+    uses: ./.github/workflows/deploy.yml
+    if: github.base_ref == 'main'
+    with:
+      environment: production
+      preview: true
+    secrets: inherit
+

.github/workflows/deploy.yml

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+name: Deploy to Vercel
+on:
+  workflow_call:
+    inputs:
+      environment:
+        required: true
+        type: string
+      preview:
+        required: false
+        type: boolean
+        default: true
+
+env:
+  VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
+  VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+            node-version: '20'
+      - name: Install dependencies
+        run: npm install
+      - name: Run tests
+        run: npm test
+  deploy-preview:
+    runs-on: ubuntu-latest
+    needs: test
+    environment: ${{ inputs.environment }}
+    steps:
+        - name: Checkout repository
+          uses: actions/checkout@v2
+        - name: Set up environment variables
+          run: | 
+            echo "VERCEL_ORG_ID=${{ secrets.VERCEL_ORG_ID }}" >> $GITHUB_ENV 
+            echo "VERCEL_PROJECT_ID=${{ secrets.VERCEL_PROJECT_ID }}" >> $GITHUB_ENV
+            if [ ${{ inputs.preview }} = true ]; then
+              echo "VERCEL_ENVIRONMENT=preview" >> $GITHUB_ENV
+              echo "VERCEL_DEPLOYMENT_FLAG=" >> $GITHUB_ENV
+            else
+              echo "VERCEL_ENVIRONMENT=production" >> $GITHUB_ENV
+              echo "VERCEL_DEPLOYMENT_FLAG=--prod" >> $GITHUB_ENV
+            fi
+        - name: Set up Node.js
+          uses: actions/setup-node@v2
+          with:
+            node-version: '20'
+        - name: Install dependencies
+          run: npm install
+        - name: Install Vercel CLI
+          run: npm install -g vercel
+        - name: Pull Vercel Environment Information
+          run: vercel pull --yes --environment=$VERCEL_ENVIRONMENT --token=${{ secrets.VERCEL_TOKEN }}
+        - name: Deploy to Vercel Preview
+          run: vercel $VERCEL_DEPLOYMENT_FLAG --token=${{ secrets.VERCEL_TOKEN }}