[RFC]: Support inputs/output paths relative to different roots

This RFC is part of a larger work proposal: #814

Overview

Today lage's file paths in inputs and outputs are either relative to the current package, or relative to the dependent package. This is not always sufficient, sometimes inputs relative to the workspace need to be read. For example a config file at the root of the repo (say a shared tsconfig.json, .prettierrc, .eslintrc.js etc...) In the section below "Existing sample problem" for why it is needed (even in the lage repo).

Today there is no syntax for this in lage. There is prior art by Nx with:

{
  "inputs": ["{projectRoot}/**/*", "!{projectRoot}/**/*.md"],
   "outputs": ["{workspaceRoot}/dist/{projectName}"]
}

Lage has support for the following syntax:

  "inputs": ["**/*", "!**/*.md, "^**/*.d.ts", "!^docs/**/*.d.ts"],

So there is an option to add a 'root' character like ~, # to indicate a path relative to the workspace, or we follow the syntax of 'nx' which would allow us for a more flexible sytax.

Existing sample problem:

This is a repro for Lage's own repo:

1. Clone new lage repo
2. yarn install
3. yarn lint

• Note: All lint tasks run

lage - Version 2.7.15 - 31 Workers
[14:38:23] ✓ completed @lage-run/monorepo-scripts - lint  (1669ms)
[14:38:25] ✓ completed @lage-run/globby - lint  (2894ms)
[14:38:25] ✓ completed lage - lint  (3370ms)
[14:38:32] ✓ completed @lage-run/cache-github-actions - lint  (9.9s)
[14:38:32] ✓ completed @lage-run/config - lint  (10.11s)
[14:38:32] ✓ completed @lage-run/cache - lint  (10.19s)
<SNIP>

──┤ Waiting: 0 ├──┤ Completed: 19 / 19 (100%) ├──
Summary
┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈
success: 19, skipped: 0, pending: 0, aborted: 0, failed: 0
worker restarts: 0, max worker memory usage: 214.19 MB

┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈
Took a total of 12.50s to complete.

5. yarn lint

• Note: All lint tasks are cached

d:\src\lage>yarn lint
lage - Version 2.7.15 - 31 Workers
[14:38:48] - skipped   @lage-run/monorepo-scripts - lint  (1037ms)
[14:38:48] - skipped   @lage-run/cache-github-actions - lint  (1049ms)
[14:38:48] - skipped   @lage-run/cache - lint  (1071ms)
<SNIP>

──┤ Waiting: 0 ├──┤ Completed: 19 / 19 (100%) ├──

Summary
┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈
success: 0, skipped: 19, pending: 0, aborted: 0, failed: 0
worker restarts: 0, max worker memory usage: 11.12 MB
┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈
Took a total of 2.95s to complete. All targets skipped!

6. echo BADJS >> .eslintrc.js
7. yarn lint

• Note: Still all cached, expected reruns..

d:\src\lage>yarn lint
lage - Version 2.7.15 - 31 Workers
[14:38:48] - skipped   @lage-run/monorepo-scripts - lint  (1037ms)
[14:38:48] - skipped   @lage-run/cache-github-actions - lint  (1049ms)
[14:38:48] - skipped   @lage-run/cache - lint  (1071ms)
<SNIP>

──┤ Waiting: 0 ├──┤ Completed: 19 / 19 (100%) ├──

Summary
┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈
success: 0, skipped: 19, pending: 0, aborted: 0, failed: 0
worker restarts: 0, max worker memory usage: 11.12 MB
┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈
Took a total of 2.95s to complete. All targets skipped!

7. yarn lint --no-cache

• Note: Now it is failing....

lage - Version 2.7.15 - 31 Workers
[14:39:00] ✓ completed @lage-run/monorepo-scripts - lint  (1001ms)
[14:39:00] ✓ completed @lage-run/globby - lint  (1439ms)
[14:39:00] ✓ completed lage - lint  (1480ms)
[14:39:02] ✗ failed    @lage-run/cache - lint  (3236ms)
<SNIP>

──┤ Waiting: 0 ├──┤ Completed: 19 / 19 (100%) ├──

Summary
┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈
success: 3, skipped: 0, pending: 0, aborted: 0, failed: 1
worker restarts: 0, max worker memory usage: 13.19 MB
┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈