Add .gitignore to docker directory

To avoid including the created image in the git by accident

Issue-ID: OOM-1551
Change-Id: I7144a063ed45ee8511912adb2aa1024965d452d0
Signed-off-by: Petr Ospalý <p.ospaly@partner.samsung.com>
diff --git a/ansible/docker/.gitignore b/ansible/docker/.gitignore
new file mode 100644
index 0000000..7df2d85
--- /dev/null
+++ b/ansible/docker/.gitignore
@@ -0,0 +1,3 @@
+ansible_docker.tar
+ansible_chroot.tgz
+ansible_chroot