Add xz to docker image

buildbucket/Dockerfile

@@ -8,7 +8,7 @@ COPY buildbucket_environment.yaml .
 COPY package.sh .
 
 # Install the `which` command for debugging
-RUN dnf -y install which git findutils && dnf clean all
+RUN dnf -y install which git findutils xz && dnf clean all
 
 # Download and install miniforge
 # https://github.com/conda-forge/miniforge#miniforge