Reducing diff.

tools/dockerfile/interoptest/grpc_interop_go/build_interop.sh

@@ -31,12 +31,14 @@
 # Builds Go interop server and client in a base image.
 set -e
 
-
 # Clone just the grpc-go source code without any dependencies.
 # We are cloning from a local git repo that contains the right revision
 # to test instead of using "go get" to download from Github directly.
 git clone --recursive /var/local/jenkins/grpc-go src/google.golang.org/grpc
 
+# copy service account keys if available
+cp -r /var/local/jenkins/service_account $HOME || true
+
 # Get dependencies from GitHub
 # NOTE: once grpc-go dependencies change, this needs to be updated manually
 # but we don't expect this to happen any time soon.
@@ -47,9 +49,6 @@ go get golang.org/x/oauth2
 go get golang.org/x/oauth2/google
 go get google.golang.org/cloud
 
-# copy service account keys if available
-cp -r /var/local/jenkins/service_account $HOME || true
-
 # Build the interop client and server
 (cd src/google.golang.org/grpc/interop/client && go install)
 (cd src/google.golang.org/grpc/interop/server && go install)