Initial commit: Ansible playbook for Gitea Act Runner deployment

Automated deployment of act_runner on Ubuntu 20.04+ servers:
- Docker CE installation (DEB822 format)
- Node.js 24.x via NodeSource
- act_runner binary with SHA256 verification
- systemd service with security hardening
- CI: ansible-lint via Gitea Actions

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

roles/act_runner/handlers/main.yml

@@ -0,0 +1,26 @@
+---
+# =============================================================================
+# Gitea Act Runner - Ansible Handlers
+# =============================================================================
+#
+# Handlers are triggered by 'notify' in tasks and run once at the end of play.
+# They provide a way to restart services only when configuration changes.
+#
+# Usage in tasks:
+#   - name: Deploy config
+#     template: ...
+#     notify: restart act_runner
+#
+# =============================================================================
+
+# Reload systemd configuration after unit file changes.
+# Required before systemctl can see updated unit files.
+- name: Reload systemd
+  ansible.builtin.systemd:
+    daemon_reload: true
+
+# Restart the act_runner service to apply configuration changes.
+- name: Restart act_runner
+  ansible.builtin.systemd:
+    name: act_runner
+    state: restarted