- Added devcontainer configuration based on Ubuntu 24.04
- Added GitHub Actions workflow for devcontainer testing
- Update cSpell configuration to ingore spelling in devcontainer configs
- Update pre-commit hooks to exclude cSpell.json because pre-commit
fails for that file due to json with comments format
- Fix filename for cSpell config in vscode settings
- Two tests in `test_dd.rs` are now skipped if /dev/sda1 is not
available, which is the case in devcontainer
- Update check for existing gnu clone in build-gnu.sh, not checking the
existence of the directory but the presence of the .git directory.
This allows us to have the directly as a volume mount in devcontainer
- Remove temporary file `g` after use in build-gnu.sh
