Use MySQL 8 in Github Actions

Author: dalibor

.github/workflows/build.yml

@@ -123,7 +123,7 @@ jobs:
 
     services:
       mysql:
-        image: mysql:5.7
+        image: mysql:8.0
         env:
           MYSQL_DATABASE: ${{ env.MYSQL_DATABASE }}
           MYSQL_ROOT_PASSWORD: ${{ env.MYSQL_PASSWORD }}