Refactor container build and installation pipeline to use configurable Makefile parameters (e.g. DISTROS, base images) and propagate them through all build, install, and test scripts

scripts/installation/ubuntu/package.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+echo "[ubuntu/package] Building Ubuntu (Debian-style) package..."
+
+dpkg-buildpackage -us -uc -b
+
+echo "[ubuntu/package] Installing generated DEB package..."
+apt-get update
+DEBIAN_FRONTEND=noninteractive apt-get install -y ./../package-manager_*.deb
+rm -rf /var/lib/apt/lists/*
+
+echo "[ubuntu/package] Done."