cmd/go/internal/work: disallow testgo binary from installing to GOROOT

Installing to GOROOT makes tests non-parallelizable, since each test
depends on the installed contents of GOROOT already being up-to-date
and may reasonably assume that those contents do not change over the
course of the test.

Fixes #37573
Updates #30316

Change-Id: I2afe95ad11347bee3bb7c2d77a657db6d691cf05
Reviewed-on: https://go-review.googlesource.com/c/go/+/225897
Reviewed-by: Michael Matloob <matloob@golang.org>
6 files changed
tree: c58de845088af5934fb5792782c029a451a02ec4
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. SECURITY.md
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