chore: ignore usergroup add fail

Author: soulteary

Dockerfile

@@ -15,14 +15,15 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 
 # 使用非 root 用户运行，避免 GitHub Actions Runner 报 "Must not run with sudo"
 # UID/GID 1000 与常见宿主机首用户一致，挂载 runners 卷时权限更易匹配
-RUN groupadd -g 1000 app && useradd -r -u 1000 -g app -d /app -s /bin/bash app
+# 基础镜像可能已有 GID 1000，先尝试创建组，失败则复用已有组
+RUN (groupadd -g 1000 app 2>/dev/null || true) && useradd -r -u 1000 -g 1000 -d /app -s /bin/bash app
 
 WORKDIR /app
 COPY --from=builder /app/runner-manager .
 COPY --from=builder /app/config.yaml ./config.yaml
 RUN mkdir -p /app/scripts /app/runners
 COPY scripts/install-runner.sh /app/scripts/install-runner.sh
-RUN chmod +x /app/scripts/install-runner.sh && chown -R app:app /app
+RUN chmod +x /app/scripts/install-runner.sh && chown -R 1000:1000 /app
 
 USER app
 EXPOSE 8080