Update image to install docker and fix permissions

PiperOrigin-RevId: 266467361

kokoro/ubuntu1604/25_docker.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+# Copyright 2019 The gVisor Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Add dependencies.
+apt-get update && apt-get -y install \
+    apt-transport-https \
+    ca-certificates \
+    curl \
+    gnupg-agent \
+    software-properties-common
+
+# Install the key.
+curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
+
+# Add the repository.
+add-apt-repository \
+   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
+   $(lsb_release -cs) \
+   stable"
+
+# Install docker.
+apt-get update && apt-get install -y docker-ce docker-ce-cli containerd.io

kokoro/ubuntu1604/40_kokoro.sh

@@ -23,7 +23,7 @@ declare -r ssh_public_keys=(
 )
 
 # Install dependencies.
-apt-get update && apt-get install -y rsync coreutils python-psutil
+apt-get update && apt-get install -y rsync coreutils python-psutil qemu-kvm
 
 # We need a kbuilder user.
 if useradd -c "kbuilder user" -m -s /bin/bash kbuilder; then
@@ -39,6 +39,12 @@ cat > /etc/sudoers.d/kokoro <<EOF
 kbuilder ALL=(ALL) NOPASSWD:ALL
 EOF
 
+# Ensure we can run Docker without sudo.
+usermod -aG docker kbuilder
+
+# Ensure that we can access kvm.
+usermod -aG kvm kbuilder
+
 # Ensure that /tmpfs exists and is writable by kokoro.
 #
 # Note that kokoro will typically attach a second disk (sdb) to the instance

kokoro/ubuntu1804/25_docker.sh

@@ -0,0 +1 @@
+../ubuntu1604/25_docker.sh