When I try to use the command “Remote-Containers: Reopen in Container”, it asks me to “select a container configuration definition”. So far, I was able to start the remote container without specifying anything.
The configuration is supposed to be defined inside .devcontainer/devcontainer.json, which is in located in the root of the proc_image_processing project. Make sure that when you select File -> Open Folder, you choose the folder that contains your proc_image_processing project. Once opened, you should have a similar file tree to the one in the picture below.