feat: add dedicated portfolio Gitea runner

scripts/check-runner.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+repo_root="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$repo_root"
+
+docker compose config --quiet
+docker compose ps
+docker compose exec runner test -s /data/.runner
+
+docker run --rm \
+  -v /var/run/docker.sock:/var/run/docker.sock \
+  portfolio-runner-job:node22 \
+  sh -lc 'node --version && npm --version && git --version && docker version && docker buildx version && docker compose version'
+
+echo "Runner registration, Docker access, and job-image tools are ready."