feat(searxng): added new role to install and configure searxng

ansible_collections/nullified/infrastructure/roles/searxng/tasks/gather_facts.yml

@@ -0,0 +1,17 @@
+---
+- name: find systemd unit directory
+  become: true
+  ansible.builtin.command: pkg-config systemd --variable=systemd_system_conf_dir
+  changed_when: false
+  register: systemd_unit_directory_cmd
+- name: find systemd version
+  become: true
+  ansible.builtin.shell: >
+    systemctl --version | awk '{if($1=="systemd" && $2~"^[0-9]+$"){print $2}}'
+  changed_when: false
+  register: systemd_version_cmd
+- name: set facts
+  ansible.builtin.set_fact:
+    systemd_unit_directory: "{{ systemd_unit_directory_cmd.stdout }}"
+    systemd_version: "{{ systemd_version_cmd.stdout | int }}"
+    searxng_conf_server_secret_key: "{{ searxng_conf_server_secret_key | default(lookup('ansible.builtin.password', '/dev/null', length=64), true) }}"