diff --git a/.github/workflows/test-coverage.yml b/.github/workflows/test-coverage.yml
new file mode 100644
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+++ b/.github/workflows/test-coverage.yml
@@ -0,0 +1,156 @@
+name: Code Coverage Report
+
+on:
+  # Once weekly On Sundays at 00:00 UTC.
+  schedule:
+    - cron: '0 0 * * 0'
+
+env:
+  LOCAL_DIR: build
+  PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: ${{ true }}
+  COMPOSER_INSTALL: ${{ false }}
+  # Controls which NPM script to use for running PHPUnit tests. Options ar `php` and `php-composer`.
+  PHPUNIT_SCRIPT: php
+  LOCAL_PHP: '7.4-fpm'
+  LOCAL_PHP_XDEBUG: true
+  LOCAL_PHP_MEMCACHED: ${{ false }}
+
+jobs:
+  # Sets up WordPress for testing or development use.
+  #
+  # Performs the following steps:
+  # - Set environment variables.
+  # - Checks out the repository.
+  # - Checks out the WordPress Importer plugin (needed for the Core PHPUnit tests).
+  # - Logs debug information about the runner container.
+  # - Installs NodeJS 14.
+  # - Sets up caching for NPM.
+  # _ Installs NPM dependencies using install-changed to hash the `package.json` file.
+  # - Builds WordPress to run from the `build` directory.
+  # - Logs Docker debug information (about the Docker installation within the runner).
+  # - Starts the WordPress Docker container.
+  # - Logs debug general information.
+  # - Logs the running Docker containers.
+  # - Logs WordPress Docker container debug information.
+  # - Logs debug information about what's installed within the WordPress Docker containers.
+  # - Install WordPress within the Docker container.
+  # - Run the PHPUnit tests.
+  # - Creates a ZIP file of the code coverage report.
+  # - Uploads ZIP file as an artifact.
+  # - Run the PHPUnit tests as a multisite.
+  # - Creates a ZIP file of the code coverage report.
+  # - Uploads ZIP file as an artifact.
+  test-coverage-report:
+    name: Generate a code coverage report
+    runs-on: ubuntu-latest
+    if: ${{ github.repository == 'WordPress/wordpress-develop' }}
+
+    steps:
+      - name: Configure environment variables
+        run: |
+          echo "PHP_FPM_UID=$(id -u)" >> $GITHUB_ENV
+          echo "PHP_FPM_GID=$(id -g)" >> $GITHUB_ENV
+
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Checkout the WordPress Importer plugin
+        run: svn checkout -r 2387243 https://plugins.svn.wordpress.org/wordpress-importer/trunk/ tests/phpunit/data/plugins/wordpress-importer
+
+      - name: Log debug information
+        run: |
+          echo "$GITHUB_REF"
+          echo "$GITHUB_EVENT_NAME"
+          npm --version
+          node --version
+          curl --version
+          git --version
+          svn --version
+          php --version
+          php -i
+          locale -a
+
+      - name: Install NodeJS
+        uses: actions/setup-node@v1
+        with:
+          node-version: 14
+
+      - name: Cache NodeJS modules
+        uses: actions/cache@v2
+        env:
+          cache-name: cache-node-modules
+        with:
+          # npm cache files are stored in `~/.npm` on Linux/macOS
+          path: ~/.npm
+          key: ${{ runner.os }}-npm-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-npm-
+
+      - name: Install Dependencies
+        run: npx install-changed --install-command="npm ci"
+
+      - name: Build WordPress
+        run: npm run build
+
+      - name: Docker debug information
+        run: |
+          docker -v
+          docker-compose -v
+
+      - name: Start Docker environment
+        run: |
+          npm run env:start
+
+      - name: General debug information
+        run: |
+          npm --version
+          node --version
+          curl --version
+          git --version
+          svn --version
+
+      - name: Log running Docker containers
+        run: docker ps -a
+
+      - name: WordPress Docker container debug information
+        run: |
+          docker-compose run --rm mysql mysql --version
+          docker-compose run --rm php php --version
+          docker-compose run --rm php php -m
+          docker-compose run --rm php php -i
+          docker-compose run --rm php locale -a
+
+      - name: Install WordPress
+        run: npm run env:install
+
+      - name: Run tests as a single site
+        run: npm run test:${{ env.PHPUNIT_SCRIPT }} -- --verbose -c phpunit.xml.dist --coverage-html wp-code-coverage-single-${{ github.sha }}
+
+      - name: Create ZIP artifact of single site results
+        uses: thedoctor0/zip-release@0.4.1
+        with:
+          filename: wp-code-coverage-single-${{ github.sha }}.zip
+          path: wp-code-coverage-single-${{ github.sha }}
+
+      - name: Upload single site coverage report
+        uses: actions/upload-artifact@v2
+        with:
+          name: wp-code-coverage-single-${{ github.sha }}
+          path: wp-code-coverage-single-${{ github.sha }}.zip
+          if-no-files-found: error
+
+      - name: Run tests as a multisite install
+        run: npm run test:${{ env.PHPUNIT_SCRIPT }} -- --verbose -c tests/phpunit/multisite.xml --coverage-html wp-code-coverage-multisite-${{ github.sha }}
+
+      - name: Create ZIP artifact of multisite results
+        uses: thedoctor0/zip-release@0.4.1
+        with:
+          filename: wp-code-coverage-multisite-${{ github.sha }}.zip
+          path: wp-code-coverage-multisite-${{ github.sha }}
+
+      - name: Upload multisite coverage report
+        uses: actions/upload-artifact@v2
+        with:
+          name: wp-code-coverage-multisite-${{ github.sha }}
+          path: wp-code-coverage-multisite-${{ github.sha }}.zip
+          if-no-files-found: error