Add Selenium image to moodle-ci.yml

Add Selenium image for Behat testing in CI workflow.

Author: EJMFarrow

.github/workflows/moodle-ci.yml

@@ -127,6 +127,7 @@ jobs:
           DB: ${{ matrix.database }}
           MOODLE_BRANCH: ${{ matrix.moodle-branch }}
           MOODLE_APP: 'true'
+          MOODLE_BEHAT_SELENIUM_IMAGE: 'selenium/standalone-chrome:145.0-20260222'
 
       - name: Behat features
         if: ${{ always() }}