Keep workflows active

Github will disable workflows for inactive projects, and a project goes inactive after 60 days with no commits.

This will stop smoke tests from detecting breaking changes from upstream package updates.

One solution (which I don't like, but I'm just leaving here to show there are automated solutions): https://github.com/marketplace/actions/keepalive-workflow

Alternatively, you have to pay attention to the github notifications and re-activate workflows each time you get an alert that they're being de-activated. From @DinoBektesevic:

Every 60 days or so without a commit, you just have to go to the actions tab and press "Enable worfklow" again. The issue I have with the automatic disable isn't that it happens it's that the notifications are by default enabled just for the person that made the workflow - not all "admins" or "maintainers" of the repo. This is how sometimes these things go by unnoticed unfortunately because people don't subscribe or watch the action (which I don't think you can do). There's an email GA that can be used as a replacement I believe.

首先检查仓库的 GitHub Actions 工作流，以及用于检测上游软件包更新所引入的 breaking changes 的 smoke tests。将自动化 keepalive 方案与文档中说明的手动重新激活流程和通知行为进行比较。完成的标准应是，所选方案能够防止工作流在一段时间没有提交后被静默禁用。