Merge pull request #11988 from jtattermusch/kokoro_unbreak_macartifacts

Fix mac jobs attempting to use gfile service account key

tools/internal_ci/macos/grpc_build_artifacts.cfg

@@ -16,6 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/macos/grpc_build_artifacts.sh"
+gfile_resources: "/bigstore/grpc-testing-secrets/gcp_credentials/GrpcTesting-d0eeee2db331.json"
 timeout_mins: 120
 action {
   define_artifacts {

tools/internal_ci/macos/grpc_interop.cfg

@@ -16,6 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/macos/grpc_interop.sh"
+gfile_resources: "/bigstore/grpc-testing-secrets/gcp_credentials/GrpcTesting-d0eeee2db331.json"
 timeout_mins: 240
 action {
   define_artifacts {

tools/internal_ci/macos/pull_request/grpc_interop.cfg

@@ -16,6 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/macos/grpc_interop.sh"
+gfile_resources: "/bigstore/grpc-testing-secrets/gcp_credentials/GrpcTesting-d0eeee2db331.json"
 timeout_mins: 240
 action {
   define_artifacts {