Revert "Remove installers/docker folder"

This reverts commit a282db1e1960066376bc5475488edfc939235a66.

Change-Id: I88523ad80885c6aee41f0ecb799057362a5606ae
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/installers/docker/__ro__.env b/installers/docker/__ro__.env
new file mode 100644
index 0000000..aa47593
--- /dev/null
+++ b/installers/docker/__ro__.env
@@ -0,0 +1 @@
+RO_DB_ROOT_PASSWORD=__MYSQL_ROOT_PASSWORD__