Add PHP 7.4 to tests

.github/workflows/test.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        php: [7.1, 7.2, 7.3]
+        php: [7.1, 7.2, 7.3, 7.4]
         service: ['mysql:5.7', mariadb]
         prefix: ['', flarum_]
 
@@ -33,6 +33,12 @@ jobs:
           - php: 7.2
             service: mariadb
             prefix: flarum_
+          - php: 7.4
+            service: 'mysql:5.7'
+            prefix: flarum_
+          - php: 7.4
+            service: mariadb
+            prefix: flarum_
 
     services:
       mysql:
@@ -46,7 +52,14 @@ jobs:
       - uses: actions/checkout@master
 
       - name: Select PHP version
-        run: sudo update-alternatives --set php $(which php${{ matrix.php }})
+        run: |
+          if [ "${{ matrix.php }}" = "7.4" ]; then \
+            packages=$(apt-cache search php7.4- | grep ^php | grep -v ^php7.4-fpm | awk '{print $1}' | awk '{print $1}' | tr '\n' ' ');
+            sudo apt-get install -y php7.4 $packages; \
+          fi
+          sudo update-alternatives --set php $(which php${{ matrix.php }}) && php -v
+        env:
+          DEBIAN_FRONTEND: noninteractive
 
       - name: Create MySQL Database
         run: mysql -uroot -proot -e 'CREATE DATABASE flarum_test;' --port 13306
@@ -63,3 +76,4 @@ jobs:
 
       - name: Run Composer tests
         run: composer test
+        continue-on-error: ${{ matrix.php == 7.4 }}