Bug 1718341 - Initialize XVFB during SDK packaging. r=glandium

Differential Revision: https://phabricator.services.mozilla.com/D119224

taskcluster/docker/android-build/Dockerfile

@@ -31,6 +31,8 @@ RUN apt-get update && \
       uuid \
       valgrind \
       vim \
+      x11-utils \
+      xvfb \
       wget \
       zip \
       zstd

taskcluster/scripts/misc/repack-android-avd-linux.sh

@@ -1,6 +1,18 @@
 #!/bin/bash
 set -x -e -v
 
+# Initialize XVFB for the AVD
+. /builds/worker/scripts/xvfb.sh
+
+cleanup() {
+    local rv=$?
+    cleanup_xvfb
+    exit $rv
+}
+trap cleanup EXIT INT
+
+start_xvfb '1024x768x24' 2
+
 # This script is for fetching and repacking the Android SDK (for
 # Linux), the tools required to produce Android packages.