added role for "drone" CI/CD

roles/drone/tasks/create_app.yml

@@ -0,0 +1,19 @@
+- name: drone | create app | generate shared secret
+  command: openssl rand -hex 16
+  register: DRONE_RPC_SECRET
+
+- name: drone | create app | create docker dir
+  file:
+    path: "/opt/docker/drone"
+    state: directory
+
+- name: drone | create app | create docker-compose.yml
+  template:
+    src: "docker-compose.yml.j2"
+    dest: "/opt/docker/drone/docker-compose.yml"
+    validate: "docker-compose -f %s config" # not required. The validation command to run before copying into place. The path to the file to validate is passed in via '%s' which must be present as in the examples below. The command is passed securely so shell features like expansion and pipes will not work.
+
+- name: drone | create app | start docker container
+  command:
+    cmd: "docker-compose up -d"
+    chdir: "/opt/docker/drone"

roles/drone/tasks/main.yml

@@ -0,0 +1,11 @@
+# Load distro-specific variables
+- include_vars: "{{ ansible_distribution | lower }}.yml"
+  tags: always
+
+- block:
+  - include_role: name=docker
+  - include_tasks: create_app.yml
+
+
+  rescue:
+    - set_fact: task_failed=true