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Adds Windows support to the test/images/image-util.sh script. A Windows node with Docker installed is required to build Windows images. The connection URL to it must be set in the REMOTE_DOCKER_URL env variable. Additionally, the authentication to the remote docker node is done through certificates, which must be found in ~/.docker. By default, the REMOTE_DOCKER_URL env variable is set to "" in the Makefile, and because of it, the image-util.sh script will skip building and pushing Windows images. Added GOOS argument to the go build process in order to be able to build Windows binaries. Additionally, the OS env variable was added to the images Makefiles (default value is "linux") in order to maintain default behaviour. Some images require a different Dockerfile for Windows images, since they have different ways of installing dependencies. Because of this, if a image needs to be built for Windows, it will first check for a Dockerfile_windows file instead of the default one. If there isn't one, it means that the same Dockerfile can be used for both Windows and Linux. All Windows images will be based on the image "mcr.microsoft.com/windows/servercore:ltsc2019". There are a couple of features that are needed from this image, especially powershell. Added busybox image for Windows. Most Windows images will be based on it, which will help reduce the command line differences between Linux and Windows, but not entirely. Added Windows support for agnhost image.
iSCSI target container for testing.
Inspired by https://github.com/rvykydal/dockerfile-iscsid
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The container needs /lib/modules from the host to insert appropriate kernel modules for iscsi. This assumes that these modules are installed on the host!
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The container needs to run with docker --privileged
block.tar.gz is a small ext2 filesystem created by create_block.sh (run as root!)
