Add SonarQube configuration

.github/workflows/sonar.yaml

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+on:
+  push:
+    branches:
+      - develop
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+name: Sonarqube
+jobs:
+  sonarqube:
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.user.login != 'dependabot[bot]'
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: SonarQube Scan
+        uses: sonarsource/sonarqube-scan-action@master
+        env:
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+          SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
+
+      - name: SonarQube Quality Gate check
+        uses: sonarsource/sonarqube-quality-gate-action@master
+        timeout-minutes: 5
+        env:
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

sonar-project.properties

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+# Server and project configuration
+sonar.host.url=https://sonar.wpengine.io/
+sonar.projectVersion=1.0
+sonar.sourceEncoding=UTF-8
+sonar.scm.provider=git
+
+# Project identifiers
+sonar.projectName=wpackagist
+sonar.projectKey=wpengine_wpackagist_82f90787-67b8-45bc-8b47-99fbcfb1c1e7
+
+# Language
+sonar.language=php
+
+# Paths to source code directories (relative paths)
+sonar.sources=src
+
+# Exclusions
+sonar.exclusions=**/*_test.*, **/mocks/**, **/node_modules/**, **/vendor/**
+
+# Paths to test code directories (relative paths)
+sonar.tests=.
+sonar.test.inclusions=**/*Test.php