Initial commit: nult - Ansible deployment toolkit

Merged from veridion-gitea and veridion-act-runner-gitea repos.

nult (Null-T) - instant teleportation from Strugatsky's Noon Universe.
Like Null-T, this toolkit instantly deploys infrastructure.

Roles:
- gitea: Gitea server with PostgreSQL (Docker Compose)
- act_runner: Gitea Actions runner

Playbooks:
- gitea.yml: Deploy Gitea server
- act-runner.yml: Deploy Act Runner
- site.yml: Deploy all services

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

roles/gitea/tasks/main.yml

@@ -0,0 +1,39 @@
+---
+# =============================================================================
+# Gitea Role - Main Task Orchestration
+# =============================================================================
+#
+# This file controls the execution order of all tasks.
+# Tasks are designed to be idempotent and safe to run multiple times.
+#
+# IMPORTANT: Database migrations are handled AUTOMATICALLY by Gitea on startup.
+# The backup task MUST run before any changes to allow rollback.
+#
+# Reference: https://docs.gitea.com/installation/upgrade-from-gitea
+# =============================================================================
+
+- name: Include preflight checks
+  ansible.builtin.include_tasks: preflight.yml
+  tags:
+    - preflight
+    - always
+
+- name: Include backup tasks
+  ansible.builtin.include_tasks: backup.yml
+  tags:
+    - backup
+
+- name: Include configuration tasks
+  ansible.builtin.include_tasks: config.yml
+  tags:
+    - config
+
+- name: Include upgrade tasks
+  ansible.builtin.include_tasks: upgrade.yml
+  tags:
+    - upgrade
+
+- name: Include deployment tasks
+  ansible.builtin.include_tasks: deploy.yml
+  tags:
+    - deploy