Add buildifier sanity check

templates/tools/dockerfile/buildifier.include

@@ -0,0 +1,4 @@
+# Install buildifier v0.29.0
+RUN wget https://github.com/bazelbuild/buildtools/releases/download/0.29.0/buildifier
+RUN chmod +x buildifier
+RUN mv buildifier /usr/local/bin

templates/tools/dockerfile/test/sanity/Dockerfile.template

@@ -33,6 +33,7 @@
 
   <%include file="../../clang5.include"/>
   <%include file="../../bazel.include"/>
+  <%include file="../../buildifier.include"/>
 
   # Define the default command.
   CMD ["bash"]

tools/dockerfile/test/sanity/Dockerfile

@@ -105,6 +105,11 @@ RUN wget "https://github.com/bazelbuild/bazel/releases/download/$BAZEL_VERSION/b
   bash ./bazel-$BAZEL_VERSION-installer-linux-x86_64.sh && \
   rm bazel-$BAZEL_VERSION-installer-linux-x86_64.sh
 
+# Install buildifier v0.29.0
+RUN wget https://github.com/bazelbuild/buildtools/releases/download/0.29.0/buildifier
+RUN chmod +x buildifier
+RUN mv buildifier /usr/local/bin
+
 
 # Define the default command.
 CMD ["bash"]

tools/run_tests/sanity/check_buildifier.sh

@@ -0,0 +1,3 @@
+#! /bin/bash -ex
+
+buildifier -r -v "$(dirname "$0")/../../.."