This creates a `<binary_path>.lock` file and checks for it whenever
uploading a binary.
Parameters:
- Wait for other instance to finish: 10m
- Mark lockfile as stale and ignore it after: 10m
- When waiting on another process, check every 5seconds
We can tweak all of them.
Ideally we'd have a value in the lockfile, that lets us detect whether
the other process is still there, but I haven't found something stable
yet:
- We don't have a stable PID on the server side when we run multiple
commands
- The `ControlPath` is on the client side
Release Notes:
- N/A
Thorsten Ball
7f64f0454d