installed xtrabackup for additional tests

Signed-off-by: Renan Rangel <rrangel@slack-corp.com>

.github/workflows/cluster_endtoend_vtctlbackup_sharded_clustertest_heavy.yml

@@ -101,7 +101,7 @@ jobs:
         sudo DEBIAN_FRONTEND="noninteractive" dpkg -i mysql-apt-config*
         sudo apt-get -qq update
         # Install everything else we need, and configure
-        sudo apt-get -qq install -y mysql-server mysql-client make unzip g++ etcd curl git wget eatmydata xz-utils libncurses5
+        sudo apt-get -qq install -y mysql-server mysql-client make unzip g++ etcd curl git wget eatmydata xz-utils libncurses5 percona-xtrabackup
 
         sudo service mysql stop
         sudo service etcd stop