Prepare gated Gitea HTTPS and SSH cutover

ansible/roles/profile_server/tasks/gitea_ssh_proxy.yml

@@ -0,0 +1,61 @@
+---
+- name: Validate the Prometheus Gitea SSH cutover inputs
+  tags: [services, gitea_cutover]
+  ansible.builtin.assert:
+    that:
+      - server_gitea_cutover_tools_enabled | bool
+      - server_gitea_atlas_address is match('^[0-9]{1,3}(\.[0-9]{1,3}){3}$')
+      - server_gitea_ssh_public_port | int > 1024
+      - server_gitea_ssh_public_port | int < 65536
+      - server_gitea_ssh_target_port | int > 1024
+      - server_gitea_ssh_target_port | int < 65536
+      - server_gitea_ssh_public_port | int != 22
+    fail_msg: Keep administrative SSH on 22 and provide the Atlas rootless Gitea SSH endpoint.
+  when: server_gitea_on_atlas | bool
+
+- name: Install the Gitea SSH socket proxy units without activating them
+  tags: [services, gitea_cutover]
+  ansible.builtin.template:
+    src: "{{ item }}.j2"
+    dest: "/etc/systemd/system/{{ item }}"
+    owner: root
+    group: root
+    mode: "0644"
+  loop:
+    - prometheus-gitea-ssh-proxy.socket
+    - prometheus-gitea-ssh-proxy.service
+  loop_control:
+    label: "{{ item }}"
+  register: server_gitea_ssh_proxy_units
+  when: server_gitea_cutover_tools_enabled | bool
+
+- name: Reload systemd after Gitea SSH proxy unit changes
+  tags: [services, gitea_cutover]
+  ansible.builtin.systemd:
+    daemon_reload: true
+  when:
+    - server_gitea_cutover_tools_enabled | bool
+    - server_gitea_ssh_proxy_units is changed
+    - not ansible_check_mode
+
+- name: Manage the public Gitea SSH socket separately from administrative SSH
+  tags: [services, gitea_cutover]
+  ansible.builtin.systemd:
+    name: prometheus-gitea-ssh-proxy.socket
+    state: "{{ 'started' if server_gitea_on_atlas | bool else 'stopped' }}"
+    enabled: "{{ server_gitea_on_atlas | bool }}"
+  when:
+    - server_gitea_cutover_tools_enabled | bool
+    - not ansible_check_mode
+
+- name: Open only the public Gitea SSH port after cutover
+  tags: [services, gitea_cutover]
+  ansible.posix.firewalld:
+    port: "{{ server_gitea_ssh_public_port }}/tcp"
+    zone: "{{ server_firewalld_zone }}"
+    state: "{{ 'enabled' if server_gitea_on_atlas | bool else 'disabled' }}"
+    permanent: true
+    immediate: true
+  when:
+    - server_gitea_cutover_tools_enabled | bool
+    - server_firewall_backend == 'firewalld'