PlatformIO Devcontainer

devcontainer.json

Adds PlatformIO extension for VSCode
Exposes port 8008 so that PIO Home isn't blank when opening a PIO Home tab in VSCode
Mounts /dev so that Arduino devices on USB can read and written to
Not sure --privileged is still necessary

Dockerfile

Installs Python and Clang dependencies
Sets udev rules to allow non-root to write to arduino devices in /dev
Sets a non-root user
Installs PlatformIO CLI tools

settings.json

Sets the PIO Home port to 8008 which is the port that's exposed in devcontainer.json