What happened:
I tried to scan docker:20.10.0-rc2-git, but Syft wanted to pull 20.10.0-rc2-git:
[0002] ERROR failed to catalog: could not fetch image '20.10.0-rc2-git': pull failed: Error response from daemon: pull access denied for 20.10.0-rc2-git, repository does not exist or may require 'docker login': denied: requested access to the resource is denied

What you expected to happen:
Analysis of the docker:20.10.0-rc2-git image.

How to reproduce it (as minimally and precisely as possible):

docker pull docker:20.10.0-rc2-git
syft docker:20.10.0-rc2-git

Anything else we need to know?:
The same error occurs with Grype.

Environment:

• Output of syft version:
  Application: syft
  Version: 0.9.2
  BuildDate: 2020-12-03T21:40:41Z
  GitCommit: f87c59b
  GitTreeState: clean
  Platform: linux/amd64
  GoVersion: go1.14.12
  Compiler: gc
• OS (e.g: cat /etc/os-release or similar):
  Ubuntu 20.04.1