build core, basic and go variants and add template

build.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+set -euo pipefail
+shopt -s extglob
+
+cd "$(dirname "$0")"
+
+if (( $# == 0 )); then
+  readonly images=(core basic !(template|core|basic)/)
+else
+  readonly images=("$@")
+fi
+
+for image in "${images[@]}"; do
+  podman build -t "code-${image%/}" -f "${image%/}/Containerfile"
+done