* feat: support multiple binaries on docker
* test: docker: fixed to use binaries
* refactor: several docker pipe improvements
* fix: tag templates
* test: fix defaults test
* fix: breaking: remove .Binary, .Os, .Arch support from docker image_templates
* fix: lint issues
Updated docker documentation to use `image_templates`.
Added documentation on publishing to multiple registries
using `image_templates`
Added deprecation notices on `docker.image` and `docker.tag_templates`
Created a list of registries based on the docker image name and
additional registries. Image is then tagged with all permutations
of registry and tags.
See #832
This now allows us to use things like the ProjectName as variables
in our docker image name. This is especially helpful when trying to
make the `.goreleaser.yml` as generic as possible.
