Ensure lsb-release is installed. (#1215)

Part of tiny-pilot/ansible-role-ustreamer#77

As mention in
tiny-pilot/ansible-role-ustreamer#78 (comment):
> To accurately distinguish between Raspberry Pi OS and Debian, we need
to use the `ansible_lsb.id` fact because
`ansible_distribution=='Debian'` for both OSs. This fact is [only
defined if the `lsb-release` apt packages has been
installed](https://docs.ansible.com/ansible/latest/playbook_guide/playbooks_conditionals.html#conditionals-based-on-ansible-facts)
prior to ansible gathering facts.
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bundler/bundle/install

@@ -98,7 +98,8 @@ apt-get install -y \
   libffi-dev \
   libssl-dev \
   python3-dev \
-  python3-venv
+  python3-venv \
+  lsb-release
 
 python3 -m venv venv
 # shellcheck disable=SC1091 # Don’t follow sourced script.