build: add line breaks to build/Dockerfile

Docker build is failing for me (and for CI). Probably this behavior
varies across Docker versions.

Change-Id: I953d40582eb4a2e17459d7655f90fdae8805cb59
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/248177
Run-TryBot: Robert Findley <rfindley@google.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
diff --git a/build/Dockerfile b/build/Dockerfile
index 1f7415c..e2b3a71 100644
--- a/build/Dockerfile
+++ b/build/Dockerfile
@@ -20,18 +20,18 @@
 RUN apt-get update && apt-get install -y libnss3 libgtk-3-dev libxss1 libasound2 xvfb libsecret-1-0
 
 # Install other Go tools tests depend on
-RUN GO111MODULE=on go get -x -v github.com/acroca/go-symbols &&
-    GO111MODULE=on go get -x -v github.com/cweill/gotests/... &&
-	GO111MODULE=on go get -x -v github.com/davidrjenni/reftools/cmd/fillstruct &&
-	GO111MODULE=on go get -x -v	github.com/haya14busa/goplay/cmd/goplay &&
-  	GO111MODULE=on go get -x -v github.com/mdempsky/gocode &&
-  	GO111MODULE=on go get -x -v github.com/ramya-rao-a/go-outline &&
-  	GO111MODULE=on go get -x -v github.com/rogpeppe/godef &&
-  	GO111MODULE=on go get -x -v github.com/sqs/goreturns &&
-  	GO111MODULE=on go get -x -v github.com/uudashr/gopkgs/v2/cmd/gopkgs &&
-  	GO111MODULE=on go get -x -v github.com/zmb3/gogetdoc &&
-  	GO111MODULE=on go get -x -v golang.org/x/lint/golint &&
-  	GO111MODULE=on go get -x -v golang.org/x/tools/cmd/gorename
+RUN GO111MODULE=on go get -x -v github.com/acroca/go-symbols && \
+	GO111MODULE=on go get -x -v github.com/cweill/gotests/... && \
+	GO111MODULE=on go get -x -v github.com/davidrjenni/reftools/cmd/fillstruct && \
+	GO111MODULE=on go get -x -v	github.com/haya14busa/goplay/cmd/goplay && \
+	GO111MODULE=on go get -x -v github.com/mdempsky/gocode && \
+	GO111MODULE=on go get -x -v github.com/ramya-rao-a/go-outline && \
+	GO111MODULE=on go get -x -v github.com/rogpeppe/godef && \
+	GO111MODULE=on go get -x -v github.com/sqs/goreturns && \
+	GO111MODULE=on go get -x -v github.com/uudashr/gopkgs/v2/cmd/gopkgs && \
+	GO111MODULE=on go get -x -v github.com/zmb3/gogetdoc && \
+	GO111MODULE=on go get -x -v golang.org/x/lint/golint && \
+	GO111MODULE=on go get -x -v golang.org/x/tools/cmd/gorename
 
 WORKDIR /workspace
 ENTRYPOINT ["build/all.bash"]