adds Github Actions integration.

.github/workflows/ci.yml

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+name: Moodle Plugin CI
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '33 2 * * 1' # weekly, on Monday morning
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    services:
+      mariadb:
+        image: mariadb:10
+        env:
+          MYSQL_USER: 'root'
+          MYSQL_ALLOW_EMPTY_PASSWORD: "true"
+          MYSQL_CHARACTER_SET_SERVER: "utf8mb4"
+          MYSQL_COLLATION_SERVER: "utf8mb4_unicode_ci"
+        ports:
+          - 3306:3306
+        options: --health-cmd="mysqladmin ping" --health-interval 10s --health-timeout 5s --health-retries 3
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - php: '8.2'
+            moodle-branch: 'main'
+            database: 'mariadb'
+          - php: '8.2'
+            moodle-branch: 'MOODLE_403_STABLE'
+            database: 'mariadb'
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v3
+        with:
+          path: plugin
+
+      - name: Setup PHP ${{ matrix.php }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: ${{ matrix.extensions }}
+          ini-values: max_input_vars=5000
+          # If you are not using code coverage, keep "none". Otherwise, use "pcov" (Moodle 3.10 and up) or "xdebug".
+          # If you try to use code coverage with "none", it will fallback to phpdbg (which has known problems).
+          coverage: none
+
+      - name: Initialise moodle-plugin-ci
+        run: |
+          composer create-project -n --no-dev --prefer-dist moodlehq/moodle-plugin-ci ci ^4
+          echo $(cd ci/bin; pwd) >> $GITHUB_PATH
+          echo $(cd ci/vendor/bin; pwd) >> $GITHUB_PATH
+          sudo locale-gen en_AU.UTF-8
+          echo "NVM_DIR=$HOME/.nvm" >> $GITHUB_ENV
+
+      - name: Install moodle-plugin-ci
+        run: |
+          moodle-plugin-ci install --plugin ./plugin --db-host=127.0.0.1
+        env:
+          DB: ${{ matrix.database }}
+          MOODLE_BRANCH: ${{ matrix.moodle-branch }}
+
+      - name: PHP Lint
+        if: ${{ !cancelled() }}
+        run: moodle-plugin-ci phplint
+
+      - name: PHP Mess Detector
+        continue-on-error: true # This step will show errors but will not fail
+        if: ${{ !cancelled() }}
+        run: moodle-plugin-ci phpmd
+
+      - name: Moodle Code Checker
+        if: ${{ !cancelled() }}
+        run: moodle-plugin-ci phpcs --max-warnings 0
+
+      - name: Moodle PHPDoc Checker
+        if: ${{ !cancelled() }}
+        run: moodle-plugin-ci phpdoc --max-warnings 0
+
+      - name: Validating
+        if: ${{ !cancelled() }}
+        run: moodle-plugin-ci validate
+
+      - name: Check upgrade savepoints
+        if: ${{ !cancelled() }}
+        run: moodle-plugin-ci savepoints
+
+      - name: Mustache Lint
+        if: ${{ !cancelled() }}
+        run: moodle-plugin-ci mustache
+
+      - name: Grunt
+        if: ${{ !cancelled() }}
+        run: moodle-plugin-ci grunt --max-lint-warnings 0
+
+      - name: PHPUnit tests
+        if: ${{ !cancelled() }}
+        run: moodle-plugin-ci phpunit --fail-on-warning
+
+      - name: Behat features
+        if: ${{ !cancelled() }}
+        run: moodle-plugin-ci behat --profile chrome
+
+      - name: Mark cancelled jobs as failed.
+        if: ${{ cancelled() }}
+        run: exit 1

.phpcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<ruleset name="MoodleCore">
+  <rule ref="moodle-extra"/>
+</ruleset>