I noticed this error in CI:
```
20:37:25 INFO: Non-base image count on control daemon to delete is 9
20:37:25 "docker rmi" requires at least 1 argument.
20:37:25 See 'docker rmi --help'.
20:37:25
20:37:25 Usage: docker rmi [OPTIONS] IMAGE [IMAGE...]
20:37:25
20:37:25 Remove one or more images
```
Which indicated that the PowerShell script managed to find images to delete, but
not actually passing the images to `docker rmi`.
The reason for this failing was that the script attempted to convert the
collection/array to a string, which produces;
```powershell
Write-Output $(docker images --format "{{.Repository}}:{{.ID}}" | `
>> select-string -NotMatch "windowsservercore" | `
>> select-string -NotMatch "nanoserver" | `
>> select-string -NotMatch "docker" `
>> ).ToString()
System.Object[]
```
Which, when trying to split by the chosen separator (`:`), will return the same;
```powershell
Write-Output "System.Object[]".Split(":")[0]
```
This patch:
- Adds an intermediate variable (`$allImages`) to make the code better readable
- Switches the separator to `#`, to prevent breaking on images pulled from a
repository with a port in its name (`myregistry:5000/my/image`)
- Switches to use a comma-separated list for `-NotMatch` (for readability)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Signed-off-by: John Howard <jhoward@microsoft.com>
This is a follow-on from https://github.com/moby/moby/pull/38277
but had to be done in a couple of stages to ensure that CI didn't
break. v1.1 of the busybox image is now based on a CMD of "sh"
rather than using an entrypoint. And it also uses the bin directory
rather than `c:\busybox`. This makes it look a lot closer to the
Linux busybox image, and means that a couple of Windows-isms in
CI tests can be reverted back to be identical to their Linux
equivalents.
