Add PHP and WP-CLI so wp i18n can be run

.github/workflows/zip.yml

@@ -38,6 +38,11 @@ on:
         default: 'no'
         required: false
         type: string
+      php_version:
+        description: 'PHP version to use'
+        default: '7.4'
+        required: false
+        type: string
       i18n:
         description: 'Perform pup i18n steps'
         default: 'yes'
@@ -88,6 +93,25 @@ jobs:
           node-version-file: '.nvmrc'
           cache: 'npm'
 
+      # ------------------------------------------------------------------------------
+      # Setup PHP.
+      # ------------------------------------------------------------------------------
+      - name: Configure PHP environment
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ inputs.php_version }}
+          extensions: mbstring, intl
+          coverage: none
+
+      # ------------------------------------------------------------------------------
+      # Setup WordPress.
+      # ------------------------------------------------------------------------------
+      - name: Set up WP-CLI
+        run: |
+          wget https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar
+          chmod +x wp-cli.phar
+          sudo mv wp-cli.phar /usr/local/bin/wp
+
       # ------------------------------------------------------------------------------
       # Pup and filename setup.
       # ------------------------------------------------------------------------------