feat: add gitea-actions role for Gitea act-runner

- Create gitea-runner user with podman access
- Install podman-docker for docker CLI compatibility
- Download and configure act_runner binary
- Systemd service for act_runner daemon
- Host-mode runner labels for Fedora

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

ansible/roles/git/tasks/main.yml

@@ -8,3 +8,8 @@
 - import_tasks: gitea.yml
 # git-daemon no longer needed - commented out
 # - import_tasks: systemd.yml
+
+# Gitea Actions runner
+- include_role:
+    name: gitea-actions
+  tags: gitea-actions