travis mysql compatibility workaround

Author: malteriesch

.travis.yml

@@ -6,17 +6,14 @@ php:
   - "7.3"
   - "7.4"
 
-addons:
-  apt:
-    sources:
-      - mysql-5.6
-    packages:
-      - mysql-server
+services:
+  - mysql
 
 before_script:
   - composer self-update
   - composer install --dev --prefer-source
   - mysql -e 'create database myapp_test;'
+  - mysql -e 'SET GLOBAL sql_mode = '';'
   - sed -e 's/@MYSQL_TESTDB_HOST@/'localhost'/' -e 's/@MYSQL_TESTDB_NAME@/'myapp_test'/' -e 's/@MYSQL_TESTDB_USER@/'root'/' -e 's/@MYSQL_TESTDB_PASSWORD@/''/' tests/Functional/config.php.dist > tests/Functional/config.php