feat(test): Add tests for 'cloud volume import'

Also add test fixtures for working with cpio archives.

Signed-off-by: Cezar Craciunoiu <[email protected]>

test/e2e/cloud/fixtures/import/Dockerfile

@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright (c) 2024, Unikraft GmbH and The KraftKit Authors.
+# Licensed under the BSD-3-Clause License (the "License").
+# You may not use this file except in compliance with the License.
+
+FROM ubuntu:latest AS build
+
+RUN mkdir -p /tmp/build && \
+    echo "<p>Hello World!</p>" > /tmp/build/hello.txt
+
+FROM scratch AS import
+
+COPY --from=build /tmp/build/hello.txt /index.html