Rename forrest role to prometheus

Makes organising much simpler

ansible/roles/prometheus/tasks/grafana.yml

@@ -0,0 +1,21 @@
+- name: Create network
+  docker_network:
+    name: grafana
+
+- name: Create grafana install directory
+  file:
+    path: /opt/grafana
+    state: directory
+    owner: "{{ docker_user.name }}"
+    mode: "{{ docker_compose_directory_mask }}"
+  become: true
+
+- name: Install grafana compose file
+  template:
+    src: files/grafana/docker-compose.yml
+    dest: /opt/grafana/docker-compose.yml
+    mode: "{{ docker_compose_file_mask }}"
+    owner: "{{ docker_user.name }}"
+    validate: docker-compose -f %s config
+  notify: restart grafana
+  become: true