Bug 1637381: Add python-zstandard to ubuntu test images so they can unpack toolchains r=glandium

Differential Revision: https://phabricator.services.mozilla.com/D75356

taskcluster/docker/recipes/ubuntu1604-test-system-setup.sh

@@ -93,6 +93,8 @@ apt_packages+=('x11-xserver-utils')
 apt_packages+=('python-dev')
 apt_packages+=('python-pip')
 
+apt_packages+=('python3-pip')
+
 apt-get update
 # This allows ubuntu-desktop to be installed without human interaction
 export DEBIAN_FRONTEND=noninteractive
@@ -105,6 +107,8 @@ dpkg-reconfigure locales
 
 pip install pip==9.0.3
 pip install virtualenv==15.2.0
+pip install zstandard==0.13.0
+pip3 install zstandard==0.13.0
 
 . /setup/install-node.sh
 

taskcluster/docker/recipes/ubuntu1804-test-system-setup.sh

@@ -74,6 +74,7 @@ apt_packages+=('pulseaudio-module-bluetooth')
 apt_packages+=('pulseaudio-module-gconf')
 apt_packages+=('python-dev')
 apt_packages+=('python-pip')
+apt_packages+=('python3-pip')
 apt_packages+=('qemu-kvm')
 apt_packages+=('rlwrap')
 apt_packages+=('screen')
@@ -129,6 +130,9 @@ pip install --upgrade pip==19.2.3
 hash -r
 pip install virtualenv==15.2.0
 
+pip install zstandard==0.13.0
+pip3 install zstandard==0.13.0
+
 # Build a list of packages to purge from the image.
 apt_packages=()
 apt_packages+=('*cheese*')