support gcp-build script (#401)
support gcp-build script (#401)

* support gcp-build script

* Fix cwd

* set environment temporarily

dlorenc/runtimes-common,nkubala/runtimes-common,sharifelgamal/runtimes-common,sharifelgamal/runtimes-common,sharifelgamal/runtimes-common,sharifelgamal/runtimes-common,nkubala/runtimes-common,GoogleCloudPlatform/runtimes-common,nkubala/runtimes-common,priyawadhwa/runtimes-common,priyawadhwa/runtimes-common,sharifelgamal/runtimes-common,nkubala/runtimes-common,priyawadhwa/runtimes-common,nkubala/runtimes-common,priyawadhwa/runtimes-common,dlorenc/runtimes-common,dlorenc/runtimes-common,GoogleCloudPlatform/runtimes-common,GoogleCloudPlatform/runtimes-common,priyawadhwa/runtimes-common,sharifelgamal/runtimes-common,priyawadhwa/runtimes-common,priyawadhwa/runtimes-common,sharifelgamal/runtimes-common