Fix docker image naming issue for CI

* wrongly named PHP7 - it is PHP 5.6
* moved integration tests at the very end
* adds also MySQL tests

.drone.yml

@@ -1,29 +1,37 @@
 build:
-  integration:
-    image: morrisjobke/nextcloud-ci-php7:1.0.3
-    commands:
-      - git submodule update --init
-      - ./occ maintenance:install --admin-pass=admin
-      - cd build/integration
-      - ./run.sh
   jsunit:
     image: morrisjobke/nextcloud-ci-jsunit:1.0.2
     commands:
       - ./autotest-js.sh
   sqlite:
-    image: morrisjobke/nextcloud-ci-php7:1.0
+    image: morrisjobke/nextcloud-ci-php5.6:1.0.6
     commands:
       - rm -rf data/* config/config.php # TODO: remove this - temporary fix for CI issues
       - git submodule update --init
       - ./occ maintenance:install --database-name oc_autotest --database-user oc_autotest --admin-user admin --admin-pass admin --database sqlite --database-pass=''
       - ./autotest.sh sqlite
+  mysql:
+    image: morrisjobke/nextcloud-ci-php5.6:1.0.6
+    commands:
+      - sleep 15 # gives the database enough time to initialize
+      - rm -rf data/* config/config.php # TODO: remove this - temporary fix for CI issues
+      - git submodule update --init
+      - ./autotest.sh mysql
   postgres:
-    image: morrisjobke/nextcloud-ci-php7:1.0
+    image: morrisjobke/nextcloud-ci-php5.6:1.0.6
     commands:
       - sleep 10 # gives the database enough time to initialize
       - rm -rf data/* config/config.php # TODO: remove this - temporary fix for CI issues
       - git submodule update --init
       - ./autotest.sh pgsql
+  integration:
+    image: morrisjobke/nextcloud-ci-php5.6:1.0.6
+    commands:
+      - rm -rf data/* config/config.php # TODO: remove this - temporary fix for CI issues
+      - git submodule update --init
+      - ./occ maintenance:install --admin-pass=admin
+      - cd build/integration
+      - ./run.sh
 
 compose:
   cache:
@@ -33,3 +41,10 @@ compose:
     environment:
       - POSTGRES_USER=oc_autotest
       - POSTGRES_PASSWORD=oc_autotest
+  mysql:
+    image: mysql
+    environment:
+      - MYSQL_ROOT_PASSWORD=owncloud
+      - MYSQL_USER=oc_autotest
+      - MYSQL_PASSWORD=owncloud
+      - MYSQL_DATABASE=oc_autotest