Add self-contained automated server upgrade package

tests/run.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 set -Eeuo pipefail
 cd "$(dirname "$0")/.."
-for script in lib/common.sh usr-local-sbin/*.sh install.sh tests/run.sh; do bash -n "$script"; done
-shellcheck -x lib/common.sh usr-local-sbin/*.sh install.sh tests/run.sh
+for script in lib/*.sh usr-local-sbin/*.sh install.sh update.sh tests/run.sh; do bash -n "$script"; done
+shellcheck -x lib/*.sh usr-local-sbin/*.sh install.sh update.sh tests/run.sh
 python3 -m unittest discover -s tests -v