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>

.ansible-lint

@@ -0,0 +1,23 @@
+# =============================================================================
+# Ansible-lint Configuration
+# =============================================================================
+# See: https://ansible.readthedocs.io/projects/lint/configuring/
+
+# Use production profile (strictest)
+profile: production
+
+# Exclude paths
+exclude_paths:
+  - .git/
+  - .gitignore
+
+# Enable offline mode (don't download roles/collections)
+offline: true
+
+# Warn about these rules instead of failing
+warn_list:
+  - experimental
+
+# Skip these rules entirely (if needed)
+# skip_list:
+#   - yaml[line-length]