add swapfile role

roles/swapfile/molecule/default/converge.yml

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+---
+- name: Converge
+  hosts: all
+  become: true
+
+  pre_tasks:
+    - name: "Update apt cache"
+      when: ansible_os_family == 'Debian'
+      ansible.builtin.apt:
+        update_cache: true
+        cache_valid_time: 600
+
+  roles:
+    - role: genlab.swapfile
+      swap_file_path: /swapfile
+      swap_file_size_mb: 2000
+      swap_swappiness: 30
+      swap_file_state: present
+      swap_test_mode: true

roles/swapfile/molecule/default/molecule.yml

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+---
+dependency:
+  name: galaxy
+
+driver:
+  name: docker
+
+platforms:
+  - name: ubuntu
+    image: geerlingguy/docker-${MOLECULE_DISTRO:-ubuntu2204}-ansible:latest
+    command: ${MOLECULE_DOCKER_COMMAND:-""}
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:rw
+    cgroupns_mode: host
+    privileged: true
+    pre_build_image: true
+
+provisioner:
+  name: ansible
+  playbooks:
+    converge: ${MOLECULE_PLAYBOOK:-converge.yml}
+
+verifier:
+  name: ansible
+
+lint: |
+  set -e
+  yamllint .
+  ansible-lint .

roles/swapfile/molecule/default/verify.yml

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+---
+- name: Verify
+  hosts: all
+  gather_facts: false
+  any_errors_fatal: true
+  vars:
+    swapfile_path: "/swapfile"
+
+  pre_tasks:
+    - name: "Ensure 'file' exists"
+      ansible.builtin.package:
+        name: [file]
+        state: present
+
+  tasks:
+    - name: "Check swapfile file type"
+      register: swapfile_info
+      changed_when: false
+      ansible.builtin.command:
+        cmd: "file {{ swapfile_path }}"
+
+    - name: "Verify correct file type"
+      ansible.builtin.assert:
+        that: "'swap file' in swapfile_info.stdout"
+        success_msg: "{{ swapfile_path }}: Indeed, a Linux swap file"
+        fail_msg: "{{ swapfile_path }}: not a Linux swap file ('{{ swapfile_info.stdout }}')"