dockerfile icon not showing (Colorless)

[avastmick]

This is identical to #13, but for the Colourless theme, which is my jam.

Problem

File icon does not show for Dockerfile

Colorless these as per #13:

Expectation

File icon to show, as per colored theme:

Or as per .dockerignore

VSCode Environment

Version: 1.85.2
Commit: 8b3775030ed1a69b13e4f4c628c612102e30a681
Date: 2024-01-18T06:40:11.430Z (1 wk ago)
Electron: 25.9.7
ElectronBuildId: 26354273
Chromium: 114.0.5735.289
Node.js: 18.15.0
V8: 11.4.183.29-electron.0
OS: Darwin arm64 23.2.0

Thanks for a nice extension!