chore: import upstream snapshot with attribution

examples/ctr-example/Makefile

@@ -0,0 +1,47 @@
+# Copyright © 2025-2026 Apple Inc. and the Containerization project authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# ctr-example Makefile
+
+SWIFT = /usr/bin/swift
+
+UNAME_M := $(shell uname -m)
+KERNEL_ARCH := $(if $(filter $(UNAME_M),aarch64 arm64),arm64,$(UNAME_M))
+
+.PHONY: all build clean run
+
+all: run
+
+build:
+	$(SWIFT) build --configuration release
+	codesign --force --sign - --entitlements ctr-example.entitlements ./.build/release/ctr-example
+	cp ./.build/release/ctr-example ./ctr-example
+
+clean:
+	$(SWIFT) package clean
+	rm -f ./ctr-example
+
+run: build
+	./ctr-example
+
+# Development targets
+debug:
+	$(SWIFT) build
+	codesign --force --sign - --entitlements ctr-example.entitlements ./.build/debug/ctr-example
+
+fmt:
+	$(SWIFT) format --in-place --recursive Sources/
+fetch-default-kernel:
+	$(MAKE) -C ../.. fetch-default-kernel
+	cp -L ../../.local/vmlinux-$(KERNEL_ARCH) ./vmlinux-$(KERNEL_ARCH)