Bug: propagate -- extra flags on builder run <task1> && builder run <task2>

[ryan-roemer]

The -- propagation is very naive right now as well as builder detection. In this case, we only propagate to one of the two tasks:

// package.json
    "one": "echo one",
    "two": "echo two",
    "all": "builder run one && builder run two"

Produces this:

$ builder run all -- --hi
[builder:proc:start] Command: builder run one && builder run two -- --hi
[builder:proc:start] Command: echo one
one
[builder:proc:start] Command: echo two --hi
two --hi

Task:

• Propagate the flag to builder ... && builder ... tasks (maybe via environment?)
• Have more sophisticated builder task detection for echo NOT_BUILDER && builder run <task> too