Enable CI

Author: sad-spirit

.gitattributes

@@ -1,4 +1,5 @@
 /.gitattributes export-ignore
+/.github export-ignore
 /.gitignore export-ignore
 /package.xml export-ignore
 /docs export-ignore

.github/workflows/continuous-integration.yml

@@ -0,0 +1,66 @@
+name: Continuous Integration
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  tests:
+    runs-on: ${{ matrix.operating-system }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        operating-system: ['ubuntu-latest']
+        php-version: [ '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4' ]
+
+    name: CI on ${{ matrix.operating-system }} with PHP ${{ matrix.php-version }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+          tools: composer:v2
+          coverage: none
+
+      - name: Get Composer Cache Directory
+        id: composer-cache
+        run: |
+          echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-composer-
+
+      - name: Install dependencies with Composer
+        run: |
+          composer update --no-interaction --prefer-dist --no-progress ${{ matrix.composer-flags }}
+
+      - name: Run PHPUnit for Composer install
+        run: |
+          vendor/bin/phpunit tests
+
+      - name: Install PEAR
+        run: |
+          sudo apt-get install php-pear
+
+      - name: Install package with PEAR
+        run: |
+          pear package-validate ./package.xml
+          php ./pear-package-helper.php
+          sudo pear install ./.pear-package/package.xml
+
+      - name: Run PHPUnit for PEAR install
+        run: |
+          cd `pear config-get test_dir`
+          ${GITHUB_WORKSPACE}/vendor/bin/phpunit ./HTML_Template_Sigma