feat: dir, install changes

script/install.d/03-apt.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+# -----------------------------------------------------------------------------
+# Description:
+#   (distros with apt only) Install core apt packages.
+#
+
+if command -v apt-get &> /dev/null; then
+    apt_packages=(
+        curl
+        gnupg
+        gnupg2
+    )
+
+    sudo apt-get update
+    sudo apt-get install -qq "${apt_packages[@]}"
+    sudo apt-get autoremove
+    sudo apt-get autoclean
+
+    unset apt_packages
+fi