[add] Configuring the mysql port

database/Dockerfile

@@ -1,3 +1,7 @@
 FROM mysql:5.7
 
+# Starting scripts
 ADD . /docker-entrypoint-initdb.d
+
+# Config
+ADD my.cnf /etc/mysql

database/my.cnf

@@ -0,0 +1,20 @@
+# Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+
+[mysqld]
+port = 3307
+
+!includedir /etc/mysql/conf.d/
+!includedir /etc/mysql/mysql.conf.d/