refactor(mumble): add molecule and readme; attempt permissions

Add the expected molecule files as well as the readme for the role.
Attempt to change permissions to the uid/gid used inside the Mumble
container for the data directory.

Refs: #620

roles/mumble/docs/mumble.md

@@ -0,0 +1,15 @@
+# Mumble
+
+Homepage: <https://www.mumble.info/>
+
+Mumble is a free, open source, low latency, high quality voice chat application.
+
+## Usage
+
+Set `mumble_enabled: true` in your `inventories/<your_inventory>/nas.yml` file.
+The configuration here applies a server password, via `mumble_server_password`, to the Mumble instance, so that if you make this application available externally it won't be 
+accessible to everyone by default. That being said, it is **strongly** encouraged that
+you change this value to something unique.
+
+Clients can then connect to the service at `ansible_nas_host_or_ip:64738` using the
+password that you've definitely changed.

roles/mumble/modlecule/default/molecule.yml

@@ -0,0 +1,7 @@
+---
+provisioner:
+  inventory:
+    group_vars:
+      all:
+        mumble_enabled: true
+

roles/mumble/modlecule/default/side_effect.yml

@@ -0,0 +1,11 @@
+---
+- name: Stop
+  hosts: all
+  become: true
+  tasks:
+    - name: "Include {{ lookup('env', 'MOLECULE_PROJECT_DIRECTORY') | basename }} role"
+      include_role:
+        name: "{{ lookup('env', 'MOLECULE_PROJECT_DIRECTORY') | basename }}"
+      vars:
+        mumble_enabled: false
+

roles/mumble/modlecule/default/verify.yml

@@ -0,0 +1,19 @@
+---
+- name: Verify
+  hosts: all
+  gather_facts: false
+  tasks:
+    - include_vars:
+        file: ../../defaults/main.yml
+
+    - name: Get container state
+      docker_container_info:
+        name: "{{ mumble_container_name }}"
+      register: result
+
+    - name: Check Mumble is running
+      assert:
+        that:
+          - result.container['State']['Status'] == "running"
+          - result.container['State']['Restarting'] == false
+

roles/mumble/modlecule/default/verify_stopped.yml

@@ -0,0 +1,19 @@
+---
+- name: Verify
+  hosts: all
+  gather_facts: false
+  tasks:
+    - include_vars:
+        file: ../../defaults/main.yml
+
+    - name: Try and stop and remove Mumble
+      docker_container:
+        name: "{{ mumble_container_name }}"
+        state: absent
+      register: result
+
+    - name: Check Mumble is stopped
+      assert:
+        that:
+          - not result.changed
+

roles/mumble/tasks/main.yaml

@@ -7,11 +7,12 @@
         state: directory
         # The mumble image gets uid/gid at build time, and uses 1000 for both, by default.
         # This ends up with permission denied on the data directory, unless we fully open the permissions.
-        mode: "0777"
+        owner: 1000
+        group: 1000
       with_items:
         - "{{ mumble_data_directory }}"
 
-    - name: Mumble Docker Container
+    - name: Create Mumble Docker Container
       docker_container:
         name: "{{ mumble_container_name }}"
         image: mumblevoip/mumble-server:latest