roles/homeassistant: Deploy Home Assistant

This commit introduces a *homeassistant* role that installs and sets up
Home Assistant using `pip`.

roles/homeassistant/tasks/main.yml

@@ -0,0 +1,54 @@
+- name: ensure system dependencies are installed
+  package:
+    name:
+    - python3-pip
+    state: present
+  tags:
+  - install
+
+- name: ensure homeassistant user exists
+  user:
+    name: homeassistant
+    system: true
+    home: /var/lib/homeassistant
+
+- name: ensure homeassistant is installed
+  become: true
+  become_user: homeassistant
+  pip:
+    name: homeassistant
+    extra_args: >-
+      --user
+
+- name: ensure homeassistant entry point is installed
+  copy:
+    src: hass.sh
+    dest: /usr/local/bin/hass
+    mode: '0755'
+  notify:
+  - restart homeassistant
+- name: ensure homeassistant systemd unit is installed
+  copy:
+    src: homeassistant.service
+    dest: /etc/systemd/system/homeassistant.service
+    mode: '0644'
+  notify:
+  - reload systemd
+  - restart homeassistant
+- name: ensure homeassistant starts at boot
+  service:
+    name: homeassistant
+    enabled: true
+
+- name: ensure apache is configured to proxy for homeassistant
+  template:
+    src: homeassistant.httpd.conf.j2
+    dest: /etc/httpd/conf.d/homeassistant.conf
+    mode: '0644'
+  notify:
+  - restart httpd
+- name: ensure selinux allows apache to proxy
+  seboolean:
+    name: httpd_can_network_connect
+    state: true
+    persistent: true