Fix gcsfuse-focal issue

http://b/307349288

Author: djherbis

Dockerfile.tmpl

@@ -79,7 +79,7 @@ RUN curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key --
 # Use a fixed apt-get repo to stop intermittent failures due to flaky httpredir connections,
 # as described by Lionel Chan at http://stackoverflow.com/a/37426929/5881346
 RUN sed -i "s/httpredir.debian.org/debian.uchicago.edu/" /etc/apt/sources.list && \
-    apt-get update && \
+    apt-get update --allow-releaseinfo-change && \
     # Needed by lightGBM (GPU build)
     # https://lightgbm.readthedocs.io/en/latest/GPU-Tutorial.html#build-lightgbm
     apt-get install -y build-essential unzip cmake libboost-dev libboost-system-dev libboost-filesystem-dev p7zip-full && \