Merge pull request #1309 from mozilla/fix/use-correct-permissions r=@shane-tomlinson,@philbooth

fix(script): use correct permissions for /etc/apt file

.circleci/install-content-server.sh

@@ -3,10 +3,9 @@
 DIR=$(dirname "$0")
 
 if grep -e "fxa-content-server" -e 'all' $DIR/../packages/test.list; then
-  CLOUD_SDK_REPO="cloud-sdk-$(grep VERSION_CODENAME /etc/os-release | cut -d '=' -f 2)"
-  echo "deb http://packages.cloud.google.com/apt $CLOUD_SDK_REPO main" | tee -a /etc/apt/sources.list.d/google-cloud-sdk.list
-  curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
-  sudo apt-get update -y && sudo apt-get install google-cloud-sdk -y
+  curl -O https://dl.google.com/dl/cloudsdk/channels/rapid/downloads/google-cloud-sdk-248.0.0-linux-x86_64.tar.gz
+  tar zxvf google-cloud-sdk-248.0.0-linux-x86_64.tar.gz google-cloud-sdk
+  ./google-cloud-sdk/install.sh
   sudo apt-get install -y graphicsmagick
   mkdir -p config
   cp ../version.json ./