devcontainer: Use bash, add bashrc

[marcojob]

Description

Specifies bash as console and adds the bashrc file. This adds a lot of convenient console features such as tab completion and colors

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that causes existing functionality to not work as expected)
• Other (please describe): Vscode devcontainer convenience

Detailed Summary

• On user creation, specify bash as console
• Copy the skeleton .bashrc to the home folder of the created user

The only thing I don't fully understand is why the .bashrc is not copied automatically, but this can happen if the base image is a very minimal image

[victorreijgwart]

Thanks for this PR @marcojob! The changes look good to me. I'll import it into the main repo so that all the CI jobs can run, and then merge it to main.