Error pulling any Docker image; can't rebuild or restore any apps #41
Description
Describe the bug
Credentials store error through Docker is preventing PTS from creating or rebuilding any Docker images.
This causes an initial failure as Portainer image can't be pulled and built.
When trying to update other services (i.e. move/blitz) it fails as key images can't be pulled.
When trying to uodate or install Traefik, it fails as it can't pull new Portainer image, so can't test Portainer install.
To Reproduce
Steps to reproduce the behavior:
Run the install, or try to update the various Move/Blitz, or update core apps.
Expected behavior
If a new image is unavailable due problem reaching Docker server (either credential or network), check if old version of image already exists and use that version. At least that will allow a restoral.
Screenshots
Imgur link to two including Portainer and Traefik
