[release-branch.go1.21] cmd/go: set global .gitconfig location more robustly in tests

Also confirm that setting the location actually worked before
proceeding with the rest of the test.

This fixes a test failure with git versions older than 2.32.0.

For #53955.
For #64603.
Fixes #64586

Change-Id: I1a954975a3d8300e8b4dca045d3a15438a0407ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/548215
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/585816
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Bypass: Dmitri Shuralyov <dmitshur@golang.org>
5 files changed
tree: b01b9b4fe1f57f921aaef732cceb6b1233d02dcb
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
  17. VERSION
README.md

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