[automerger skipped] [DO NOT MERGE] Add PWD to environment variable whitelist for RBE builds. am: 77a4879e am: 17001891 -s ours am: 53265272 -s ours am: 77b2bf3b -s ours am: ef27a73a -s ours

am skip reason: Change-Id I4b51fbde330c6129654aa74f8a58dccf62cfa11d with SHA-1 77a4879e is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/12468473

Change-Id: I5a952d8c7d49bcb7911960a04c6961802bbbc0c4