Lack of dockerignore file

[AlexanderWells-diamond]

Currently there is no .dockerignore file. This presents a problem if a user installs their venv into the folder and later tries to use the Dev Container. It results in the container build trying to copy in the entirety of that virtual environment. In my case that copy was running for 10 minutes before I gave up and cancelled it.

A .dockerignore file should be added to cover venv, .venv, and similar folders.

[gilesknap]

I vote for
.venv*
venv*
as I find it useful to put contextual suffixes on venv folders.

[gilesknap]

Um, or it should match .gitignore which is the same as the above