Fix soundness (#2)

Author: FranzBusch

Sources/SwiftMemcache/empty.swift

@@ -1 +1,13 @@
-
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the swift-memcache-gsoc open source project
+//
+// Copyright (c) 2023 Apple Inc. and the swift-memcache-gsoc project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of swift-memcache-gsoc project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//

Tests/SwiftMemcacheTests/empty.swift

@@ -1 +1,13 @@
-
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the swift-memcache-gsoc open source project
+//
+// Copyright (c) 2023 Apple Inc. and the swift-memcache-gsoc project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of swift-memcache-gsoc project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//

docker/Dockerfile

@@ -15,3 +15,9 @@ ENV LANGUAGE en_US.UTF-8
 # tools
 RUN mkdir -p $HOME/.tools
 RUN echo 'export PATH="$HOME/.tools:$PATH"' >> $HOME/.profile
+
+# swiftformat (until part of the toolchain)
+ARG swiftformat_version=0.51.8
+RUN git clone --branch $swiftformat_version --depth 1 https://github.com/nicklockwood/SwiftFormat $HOME/.tools/swift-format
+RUN cd $HOME/.tools/swift-format && swift build -c release
+RUN ln -s $HOME/.tools/swift-format/.build/release/swiftformat $HOME/.tools/swiftformat