Include Moodle v5.0 RC2 in CI

Author: FMCorz

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
       fail-fast: false
       matrix:
         php: ['8.1', '8.2', '8.3']
-        moodle-branch: ['MOODLE_401_STABLE', 'MOODLE_404_STABLE', 'MOODLE_405_STABLE']
+        moodle-branch: ['MOODLE_401_STABLE', 'MOODLE_404_STABLE', 'MOODLE_405_STABLE', 'v5.0.0-rc2']
         database: [pgsql]
         include:
           # PHP 7.4, solely on Moodle 4.1.
@@ -44,11 +44,18 @@ jobs:
             database: pgsql
             php: 8.0
 
+          # PHP 8.4, with Moodle 5.0.
+          - moodle-branch: v5.0.0-rc2
+            database: pgsql
+            php: 8.4
+
         exclude:
           - moodle-branch: MOODLE_401_STABLE
             php: 8.2
           - moodle-branch: MOODLE_401_STABLE
             php: 8.3
+          - moodle-branch: v5.0.0-rc2
+            php: 8.1
 
     steps:
       - name: Check out repository code