Reads .bazel_fix_commands.json from current directory

[deadmoose]

--run_output is documented as:

Search for commands in Bazel output that match a regex and execute them, the default path of file should be in the workspace root .bazel_fix_commands.json

Calling that "the default path" is a bit of a misnomer since it's hardcoded, and then it just directly os.Opens that, so it looks in whatever your working dir happens to be.

[achew22]

@deadmoose yep, you're 100% right on this. I also think it's a bug. It should prepend the workspace

Useful links:

• Place to prepend the workspace root
• Place where we find the workspace root

This looks like a fairly simple simple fix to:

1. Update New to set a new field on the OutputRunner struct, wf workspace_finder.WorkspaceFinder to a freshly constructed workspace_finder.MainWorkspaceFinder.
2. Update readConfigs to take a workspace_finder.WorkspaceFinder and call FindWorkspace on that object then filepath.Join it with the preexisting filename in the open statement.
3. Update the test to pass in a workspace_finder.FakeWorkspaceFinder.

Is this something you'd be interested in taking on?