feat: add dedicated portfolio Gitea runner

scripts/setup-runner.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+repo_root="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$repo_root"
+
+if [[ ! -f .env ]]; then
+  cp .env.example .env
+  chmod 600 .env
+  echo "Created $repo_root/.env. Add the repository runner token, then rerun this script." >&2
+  exit 1
+fi
+
+docker build --pull --tag portfolio-runner-job:node22 .
+docker compose config --quiet
+docker compose up -d
+
+echo "Runner started. Follow logs with: docker compose logs --follow runner"