Add Dockerfile and build script for source stack image creation

test/build.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+set -eu
+
+IMAGE_NAME="${IMAGE_NAME:-test-source-stack}"
+SCRIPT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
+
+if ! command -v podman >/dev/null 2>&1; then
+    echo "Error: Podman is required." >&2
+    exit 1
+fi
+
+echo "Building image $IMAGE_NAME with podman ..."
+exec podman build --network host --tag "$IMAGE_NAME" "$SCRIPT_DIR"