chore(CI): Adjust testing matrix for Nextcloud 28 on main

Signed-off-by: Joas Schilling <[email protected]>

.github/workflows/php-test.yml

@@ -7,12 +7,14 @@ jobs:
     strategy:
       matrix:
         php-versions: ['8.0', '8.1', '8.2']
-        nextcloud-versions: ['master', 'stable27', 'stable26']
+        nextcloud-versions: ['master', 'stable28', 'stable27', 'stable26']
         include:
           - php-versions: '7.4'
             nextcloud-versions: 'stable25'
           - php-versions: '8.1'
             nextcloud-versions: 'stable25'
+          - php-versions: '8.3'
+            nextcloud-versions: 'stable28'
           - php-versions: '8.3'
             nextcloud-versions: 'master'
     name: php${{ matrix.php-versions }} on ${{ matrix.nextcloud-versions }} unit tests
@@ -29,7 +31,7 @@ jobs:
     - name: Checkout Nextcloud
       run: git clone https://github.com/nextcloud/server.git --recursive --depth 1 -b ${{ matrix.nextcloud-versions }} nextcloud
     - name: Patch version check for nightly PHP
-      if: ${{ matrix.php-versions == '8.2' }}
+      if: ${{ matrix.php-versions == '8.4' }}
       run: echo "<?php" > nextcloud/lib/versioncheck.php
     - name: Install Nextcloud
       run: php -f nextcloud/occ maintenance:install --database-name oc_autotest --database-user oc_autotest --admin-user admin --admin-pass admin --database sqlite --database-pass=''