diff --git a/.devcontainer/CMakeLists.txt b/.devcontainer/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3f18af7bf4b8e54981dc903ca103265f916cc40f
--- /dev/null
+++ b/.devcontainer/CMakeLists.txt
@@ -0,0 +1,3 @@
+# This is a dummy CMake file meant only to help the CI system to categorise the files
+# that are in this directory. This file is not meant to have *any* meaningful CMake
+# configuration in it!
diff --git a/.vscode/CMakeLists.txt b/.vscode/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3f18af7bf4b8e54981dc903ca103265f916cc40f
--- /dev/null
+++ b/.vscode/CMakeLists.txt
@@ -0,0 +1,3 @@
+# This is a dummy CMake file meant only to help the CI system to categorise the files
+# that are in this directory. This file is not meant to have *any* meaningful CMake
+# configuration in it!
diff --git a/Projects/Athena/package_filters.txt b/Projects/Athena/package_filters.txt
index 23da5f77d3491de7ae601975c72cce4abc30fd56..8957e5434057caec93591cef67dfa02b21c7b8d1 100644
--- a/Projects/Athena/package_filters.txt
+++ b/Projects/Athena/package_filters.txt
@@ -4,6 +4,8 @@
 
 # Technical package(s) that should not show up in packages.txt:
 - Build
+- .devcontainer
+- .vscode
 
 # Ignore the Projects directory:
 - Projects/.*