fix: build host setup script adjusted for limited resource ubuntu vagrant VMs

on ubuntu-20 vagrant VMs the /boot partition is too small to handle the updates to kernel initrd images and such so we run autoremove and try upgrade again.

Ticket: ENT-13854
Changelog: none

Author: craigcomstock

ci/setup-cfengine-build-host.sh

@@ -86,7 +86,12 @@ if [ -f /etc/os-release ]; then
     yum update --assumeyes
     alias software='yum install --assumeyes'
   elif grep -q debian /etc/os-release; then
-    DEBIAN_FRONTEND=noninteractive apt upgrade --yes && DEBIAN_FRONTEND=noninteractive apt autoremove --yes
+    # sometimes the /boot partition is too small to handle kernel upgrade regenerations of initrd and related files on ubuntu, so allow failure first
+    DEBIAN_FRONTEND=noninteractive apt upgrade --yes || true
+    DEBIAN_FRONTEND=noninteractive apt autoremove --yes
+    # and now perform the upgrade a second time after hopefully autoremove cleans up /boot partition of kernel files that cause failure
+    DEBIAN_FRONTEND=noninteractive apt upgrade --yes
+    DEBIAN_FRONTEND=noninteractive apt autoremove --yes
     alias software='DEBIAN_FRONTEND=noninteractive apt install --yes'
   elif grep -q suse /etc/os-release; then
     zypper -n update