PETOSS-530 - Create Github Workflow for PHP SDK to Build and Lint

.github/workflows/build-lint-test.yml

@@ -0,0 +1,32 @@
+name: PHP Build, Lint
+
+on:
+    push:
+
+jobs:
+    build-test-lint:
+        runs-on: ubuntu-latest
+
+        steps:
+            - name: Checkout xero-php repo
+              uses: actions/checkout@v4
+              with:
+                repository: XeroAPI/xero-php-oauth2
+                path: xero-php-oauth2
+
+            - name: Setup PHP
+              run: sudo apt-get install -y php php-mbstring php-intl php-xml php-zip php-curl
+
+            - name: Install Composer
+              run: |
+                php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
+                php composer-setup.php --install-dir=/usr/local/bin --filename=composer
+                php -r "unlink('composer-setup.php');"
+
+            - name: Install Dependencies
+              run: composer install
+              working-directory: xero-php-oauth2
+
+            - name: Validate PHP Syntax
+              run: find . -path ./vendor -prune -o -name "*.php" -exec php -l {} \; > /dev/null || exit 1
+              working-directory: xero-php-oauth2