Add prepare-helm role

This role downloads helm and places it in resources dir.
It is needed for testing helm role.

Change-Id: Ic7357f96d654a51592c332e4b61b0fe46a39270a
Issue-ID: OOM-1909
Signed-off-by: Michal Zegan <m.zegan@samsung.com>
diff --git a/ansible/test/roles/prepare-helm/tasks/main.yml b/ansible/test/roles/prepare-helm/tasks/main.yml
new file mode 100644
index 0000000..aa01e28
--- /dev/null
+++ b/ansible/test/roles/prepare-helm/tasks/main.yml
@@ -0,0 +1,18 @@
+---
+- name: "Ensure {{ app_data_path }}/downloads directory exists"
+  file:
+    path: "{{ app_data_path }}/downloads"
+    recurse: true
+    state: directory
+
+- name: "Download and unarchive helm-{{ helm_version }}"
+  unarchive:
+    src: "https://get.helm.sh/helm-v{{ helm_version }}-linux-amd64.tar.gz"
+    dest: "/tmp"
+    remote_src: true
+
+- name: "Copy helm binary"
+  copy:
+    src: /tmp/linux-amd64/helm
+    dest: "{{ app_data_path }}/downloads/helm"
+    remote_src: true