update gitiles

Signed-off-by: Jess Frazelle <jess@oxide.computer>

gitiles/Dockerfile

@@ -1,39 +1,27 @@
-FROM ubuntu:bionic
+FROM l.gcr.io/google/bazel:latest
 LABEL maintainer "Jessie Frazelle <jess@linux.com>"
 
 # https://gerrit.googlesource.com/gitiles/
 ENV GITILES_VERSION v0.4
 
 RUN apt-get update && apt-get install -y \
-	apt-transport-https \
 	bash \
 	ca-certificates \
 	curl \
 	git \
-	gnupg \
 	openjdk-8-jdk \
 	--no-install-recommends \
 	&& rm -rf /var/lib/apt/lists/*
 
 # install bazel
 RUN set -x \
-	&& echo "deb [arch=amd64] https://storage.googleapis.com/bazel-apt stable jdk1.8" | tee /etc/apt/sources.list.d/bazel.list \
-	&& curl https://bazel.build/bazel-release.pub.gpg | apt-key add - \
-	&& apt-get update && apt-get install -y \
-	bazel \
-	--no-install-recommends \
-	&& rm -rf /var/lib/apt/lists/* \
-	&& : install Bazel to build gitiles \
 	&& git clone --depth 1 --branch "${GITILES_VERSION}" https://gerrit.googlesource.com/gitiles /usr/src/gitiles \
 	&& ( \
 		cd /usr/src/gitiles \
 		&& bazel build java/com/google/gitiles/dev \
 		&& cp -rL bazel-bin bin \
 		&& rm -rf bazel-bin \
-	) \
-	&& : clean up unneeded packages and files \
-    && apt purge -y --auto-remove bazel \
-	&& rm /etc/apt/sources.list.d/bazel.list
+	)
 
 COPY start.sh /usr/bin/start.sh