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/test/test-e2e.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+echo ">>> Running E2E tests in all distros: $DISTROS"
+
+for distro in $DISTROS; do
+  echo "============================================================"
+  echo ">>> Running E2E tests: $distro"
+  echo "============================================================"
+
+  MOUNT_NIX=""
+  if [[ "$distro" == "arch" ]]; then
+    MOUNT_NIX="-v pkgmgr_nix_store:/nix"
+  fi
+
+  docker run --rm \
+    -v "$(pwd):/src" \
+    $MOUNT_NIX \
+    -v "pkgmgr_nix_cache:/root/.cache/nix" \
+    -e PKGMGR_DEV=1 \
+    --workdir /src \
+    --entrypoint bash \
+    "package-manager-test-$distro" \
+    -c '
+      set -e;
+
+      if [ -f /etc/os-release ]; then
+        . /etc/os-release;
+      fi;
+
+      echo "Running tests inside distro: $ID";
+
+      # Try to load nix environment
+      if [ -f "/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh" ]; then
+        . "/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh";
+      fi
+
+      if [ -f "$HOME/.nix-profile/etc/profile.d/nix.sh" ]; then
+        . "$HOME/.nix-profile/etc/profile.d/nix.sh";
+      fi
+
+      PATH="/nix/var/nix/profiles/default/bin:$HOME/.nix-profile/bin:$PATH";
+
+      command -v nix >/dev/null || {
+        echo "ERROR: nix not found.";
+        exit 1;
+      }
+
+      git config --global --add safe.directory /src || true;
+
+      nix develop .#default --no-write-lock-file -c \
+        python3 -m unittest discover \
+          -s /src/tests/e2e \
+          -p "test_*.py";
+    '
+done