add netbox role for ensuring netbox is deployed as specified

The role takes over the deployment of netbox and its dependencies, while
still requiring the user to provide the netbox version, db password and
config as well as to set up a web server and handle stuff like creating
users, etc.

roles/netbox/tasks/main.yaml

@@ -0,0 +1,103 @@
+- name: Ensure all dependencies are installed
+  ansible.builtin.apt:
+    name:
+      - python3
+      - python3-pip
+      - python3-venv
+      - python3-dev
+      - build-essential
+      - libxml2-dev
+      - libxslt1-dev
+      - libffi-dev
+      - libpq-dev
+      - libssl-dev
+      - zlib1g-dev
+      - git
+  become: true
+
+- name: Ensure NetBox source is present
+  ansible.builtin.git:
+    repo: https://github.com/netbox-community/netbox.git
+    dest: /opt/netbox/
+    version: "{{ netbox__version }}"
+  become: true
+  notify:
+    - Run upgrade script
+    - Ensure netbox systemd services are set up and up-to-date
+
+- name: Ensure netbox user
+  block:
+    - name: Ensure netbox group exists
+      ansible.builtin.group:
+        name: netbox
+        system: true
+      become: true
+
+    - name: Ensure netbox user exists
+      ansible.builtin.user:
+        name: netbox
+        group: netbox
+        password: '!'
+        system: true
+      become: true
+
+- name: Ensure relevant directories are owned by netbox user
+  ansible.builtin.file:
+    path: "{{ item }}"
+    state: directory
+    owner: netbox
+    recurse: true
+  become: true
+  loop:
+    - "/opt/netbox/netbox/media/"
+    - "/opt/netbox/netbox/reports/"
+    - "/opt/netbox/netbox/scripts/"
+
+- name: Deploy configuration.py
+  ansible.builtin.copy:
+    content: "{{ netbox__config }}"
+    dest: "/opt/netbox/netbox/netbox/configuration.py"
+    mode: "0644"
+    owner: root
+    group: root
+  become: true
+  notify: Ensure netbox systemd services are set up and up-to-date
+
+- name: Ensure provided gunicorn config is copied
+  ansible.builtin.copy:
+    remote_src: true
+    src: "/opt/netbox/contrib/gunicorn.py"
+    dest: "/opt/netbox/gunicorn.py"
+    mode: "0644"
+    owner: root
+    group: root
+  become: true
+  notify: Ensure netbox systemd services are set up and up-to-date
+
+- name: Ensure provided netbox systemd service files are copied
+  ansible.builtin.copy:
+    remote_src: true
+    src: "/opt/netbox/contrib/{{ item }}"
+    dest: "/etc/systemd/system/{{ item }}"
+    mode: "0644"
+    owner: root
+    group: root
+  become: true
+  loop:
+    - "netbox.service"
+    - "netbox-rq.service"
+  notify: Ensure netbox systemd services are set up and up-to-date
+
+- name: Ensure provided housekeeping systemd service and timer are copied
+  ansible.builtin.copy:
+    remote_src: true
+    src: "/opt/netbox/contrib/{{ item }}"
+    dest: "/etc/systemd/system/{{ item }}"
+    mode: "0644"
+    owner: root
+    group: root
+  become: true
+  loop:
+    - "netbox-housekeeping.service"
+    - "netbox-housekeeping.timer"
+  notify: Ensure netbox housekeeping timer is set up and up-to-date