windows not working properly

[caarlos0]

so, couple of issues:

• we can't use windows images on linux, not even pull them
• caching on windows and restoring on linux was broken
• artifacts.json need to have the paths on unix format (forward slashes) goreleaser/goreleaser@af38a4c

[caarlos0]

https://github.com/caarlos0/goreleaser-pro-split-merge-example-real/releases/tag/v0.0.2

except for the windows docker images, everything else is done