pw_cli: Add env var
pw_cli: Add env var

Bug: b/244166911
Change-Id: Id4bf01714390bfc5362aec131daa83118837a0de
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/109512
Reviewed-by: Ted Pudlik <c7372cc3e451acc046049fca9e050bcb2a4a3d11@google.com>
Pigweed-Auto-Submit: Rob Mohr <d07614a8a0b466db08f68224f87d738b0f9615cf@google.com>
Reviewed-by: Wyatt Hepler <cca3bedb37979eacd157a9bceb473582df8aea1e@google.com>

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed