Enable licence header check

Author: plemarquand

.github/workflows/pull_request.yml

@@ -9,8 +9,7 @@ jobs:
     name: Soundness
     uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main
     with:
-      # https://github.com/swiftlang/github-workflows/issues/48
-      license_header_check_enabled: false
+      license_header_check_enabled: true
       license_header_check_project_name: "VS Code Swift"
       api_breakage_check_enabled: false
       docs_check_enabled: false

docker/Dockerfile

@@ -1,3 +1,16 @@
+#===----------------------------------------------------------------------===//
+#
+# This source file is part of the VS Code Swift open source project
+#
+# Copyright (c) 2024 the VS Code Swift project authors
+# Licensed under Apache License v2.0
+#
+# See LICENSE.txt for license information
+# See CONTRIBUTORS.txt for the list of VS Code Swift project authors
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+#===----------------------------------------------------------------------===//
 ARG swift_version=5.10
 ARG ubuntu_version=jammy
 ARG base_image=swift:$swift_version-$ubuntu_version