Show first run before job name & add global env vars

[louis77]

Hey there, first of all thank you for this awesome project! ❤️

I have > 200 jobs and spotting those which failed became very hard. So I moved the status indicator for the most recent run before the job name. This way I can easily see which run failed. I also added a real tooltip over the indicators, so that the last run timestamp pops up immediately, and fixed a small Alpine issue.

I've also added a top-level "env" key in the YAML schedule for schedule-level env vars that are passed to every job.

The order of env var processing is now:

1. Add the system env vars (os.Envrion)
2. Add the global env vars
3. Add the job-local env vars

Perhaps you're interested in pulling this.