Add GitHub Actions workflows for everything currently handled in Trav…

…is CI.

.github/workflows/coding-standards.yml

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+name: PHP Coding standards
+
+on: [push]
+
+jobs:
+  # Runs PHP coding standards checks.
+  #
+  # Violations are reported inline with annotations.
+  #
+  # Performs the following steps:
+  # - Checks out the repository.
+  # - Configures caching for Composer.
+  # - Sets up PHP.
+  # - Logs debug information.
+  # - Installs Composer dependencies (from cache if possible).
+  # - Logs PHP_CodeSniffer debug information.
+  # - Runs PHPCS tests.
+  # - todo: Add a PHP_CodeSniffer scan for the `tests` directory that does not suppress warnings.
+  # - todo: Configure Slack notifications for failing scans.
+  phpcs:
+    name: Check PHP coding standards
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Get Composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Set up Composer caching
+        uses: actions/cache@v2
+        env:
+          cache-name: cache-composer-dependencies
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-composer-
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "latest"
+          coverage: none
+
+      - name: Log debug information
+        run: |
+          php --version
+          composer --version
+
+      - name: Install Composer dependencies
+        run: |
+          composer install --prefer-dist --no-suggest --no-progress --no-ansi --no-interaction
+          echo "vendor/bin" >> $GITHUB_PATH
+
+      - name: Log PHPCS debug information
+        run: phpcs -i
+
+      - name: Run PHPCS on Core files
+        uses: wearerequired/lint-action@v1
+        with:
+          github_token: ${{ secrets.github_token }}
+          php_codesniffer: true
+          # Ignore warnings
+          php_codesniffer_args: "-n"

.github/workflows/end-to-end-tests.yml

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+name: End-to-end Tests
+
+on: [push]
+
+env:
+  LOCAL_DIR: build
+  PHP_FPM_UID: 1001 # This needs to be dynamic
+  PHP_FPM_GID: 116 # This needs to be dynamic
+
+jobs:
+  # Runs the end-to-end test suite.
+  #
+  # Performs the following steps:
+  # - Cancels all previous workflow runs that have not completed.
+  # - Checks out the repository.
+  # - Logs debug information about the runner container.
+  # - Sets up caching for NPM.
+  # - Installs NPM 12 (todo: install the version of NPM specified in the `.nvmrc` file to support older branches)
+  # _ Installs NPM dependencies.
+  # - Builds WordPress to run from the `build` directory.
+  # - Starts the WordPress Docker container.
+  # - Logs general debug information.
+  # - Logs the running Docker containers.
+  # - Logs Docker debug information (about both the Docker installation within the runner and the WordPress container)
+  # - Install WordPress within the Docker container.
+  # - Run the E2E tests.
+  # - todo: Configure Slack notifications for failing tests.
+  e2e-tests:
+    name: E2E Tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Cancel previous runs of this workflow
+        uses: styfle/[email protected]
+        with:
+          access_token: ${{ github.token }}
+
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Log debug information
+        run: |
+          npm --version
+          node --version
+          curl --version
+          git --version
+          svn --version
+          php --version
+          php -i
+          locale -a
+
+      - name: Cache Node 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 NPM
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Build WordPress
+        run: npm run build
+
+      - 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: Docker debug information
+        run: |
+          docker -v
+          docker-compose -v
+          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 E2E tests
+        run: npm run test:e2e

.github/workflows/javascript-tests.yml

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+name: JavaScript Tests
+
+on: [push]
+
+jobs:
+  # Runs the QUnit tests for WordPress.
+  #
+  # Performs the following steps:
+  # - Cancels all previous workflow runs that have not completed.
+  # - Checks out the repository.
+  # - Logs debug information about the runner container.
+  # - Sets up caching for NPM.
+  # - Installs NPM 12 (todo: install the version of NPM specified in the `.nvmrc` file to support older branches)
+  # - Logs updated debug information.
+  # _ Installs NPM dependencies.
+  # - Run the WordPress QUnit tests.
+  # - todo: Configure Slack notifications for failing tests.
+  test-js:
+    name: QUnit Tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Cancel previous runs of this workflow
+        uses: styfle/[email protected]
+        with:
+          access_token: ${{ github.token }}
+
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Log debug information
+        run: |
+          npm --version
+          node --version
+          git --version
+          svn --version
+
+      - name: Cache Node 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 NPM
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12
+
+      - name: Log debug information
+        run: |
+          npm --version
+          node --version
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Run QUnit tests
+        run: npm run grunt travis:js

.github/workflows/php-compatibility-testing.yml

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+name: PHP Compatibility
+
+on: [push]
+
+jobs:
+
+  # Runs PHP compatibility testing.
+  #
+  # Violations are reported inline with annotations.
+  #
+  # Performs the following steps:
+  # - Checks out the repository.
+  # - Configures caching for Composer.
+  # - Sets up PHP.
+  # - Logs debug information about the runner container.
+  # - Installs Composer dependencies (from cache if possible).
+  # - Logs PHP_CodeSniffer debug information.
+  # - Runs the PHP compatibility tests.
+  # - todo: Configure Slack notifications for failing scans.
+  php-comatibility:
+    name: Check PHP compatibility
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Get Composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Set up Composer caching
+        uses: actions/cache@v2
+        env:
+          cache-name: cache-composer-dependencies
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-composer-
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "latest"
+          coverage: none
+
+      - name: Log debug information
+        run: |
+          php --version
+          composer --version
+
+      - name: Install Composer dependencies
+        run: |
+          composer install --prefer-dist --no-suggest --no-progress --no-ansi --no-interaction
+          echo "vendor/bin" >> $GITHUB_PATH
+
+      - name: Log PHPCS debug information
+        run: phpcs -i
+
+      - name: Run PHP compatibility tests
+        uses: wearerequired/lint-action@v1
+        with:
+          github_token: ${{ secrets.github_token }}
+          php_codesniffer: true
+          php_codesniffer_args: "--standard=phpcompat.xml.dist"