[roll pigweed] pw_env_setup: Add helper to install CIPD hook

Add a helper in util.sh to install the CIPD post-checkout hook. It's not
used anywhere, but downstream projects can add it to their local copy of
bootstrap.sh.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/105165

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: abed81c4ef1ede9..ca6de894c97c714
Roller-URL: https://ci.chromium.org/b/8806636087512084657
Cq-Cl-Tag: roller-builder:pigweed-zephyr-roller
Cq-Cl-Tag: roller-bid:8806636087512084657
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ia1e9ab521ce2afca89d44ef0b9831c25b2a33850
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/105227
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/pigweed b/pigweed
index abed81c..ca6de89 160000
--- a/pigweed
+++ b/pigweed
@@ -1 +1 @@
-Subproject commit abed81c4ef1ede956e49ec3f972c5b929e28aa8a
+Subproject commit ca6de894c97c7149d8fb1b8140130cf789c25ec7