feat: add {add,remove}-copybara-credential-store roles

Change-Id: I4f054ceb410b3082b109a5c24e3e9a8105c6c169
diff --git a/roles/add-copybara-credential-store/tasks/main.yaml b/roles/add-copybara-credential-store/tasks/main.yaml
new file mode 100644
index 0000000..f42e75e
--- /dev/null
+++ b/roles/add-copybara-credential-store/tasks/main.yaml
@@ -0,0 +1,4 @@
+- name: Create git credential store
+  ansible.builtin.template:
+    src: "git-credentials.j2"
+    dest: "{{ filename }}"