Install MySQL 5.7 on Travis CI [skip appveyor] (#13835)

.ci/install-mysql-5.7.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+#
+# This file is part of the Phalcon Framework.
+#
+# (c) Phalcon Team <[email protected]>
+#
+# For the full copyright and license information, please view the
+# LICENSE.txt file that was distributed with this source code.
+
+# Ensure that this is being run inside a CI container
+if [ "${CI}" != "true" ];
+then
+	>&2 echo "This script is designed to run inside a CI container only."
+	>&2 echo "Aborting."
+	exit 1
+fi
+
+echo mysql-apt-config mysql-apt-config/select-server select mysql-5.7 | sudo debconf-set-selections
+wget https://dev.mysql.com/get/mysql-apt-config_0.7.3-1_all.deb
+sudo dpkg --install mysql-apt-config_0.7.3-1_all.deb
+sudo apt-get update -q
+sudo apt-get install -q -y --allow-unauthenticated -o Dpkg::Options::=--force-confnew mysql-server
+sudo mysql_upgrade

.travis.yml

@@ -18,14 +18,10 @@ branches:
 
 addons:
   apt:
-    sources:
-      - mysql-5.7-trusty
     packages:
       - beanstalkd
       - gdb
       - lcov
-      - mysql-server
-      - mysql-client
   postgresql: "9.4"
 
 matrix:
@@ -86,6 +82,7 @@ before_install:
     export PHP_PEAR_PHP_BIN=$(phpenv which php)
 
 install:
+  - .ci/install-mysql-5.7.sh
   - tests/_ci/setup-dbs.sh
   - tests/_ci/pear-setup.sh
   - .ci/install-prereqs.sh