ci: move to non-Docker version of goreleaser

This was the only option at the time this workflow was created, but now
it can work as a native, cross-platform action.

Also address a goreleaser deprecation:

    https://goreleaser.com/deprecations/#brewsgithub

Tested locally run using the version of goreleaser we are pinned to via:

    goreleaser --snapshot --skip-publish --rm-dist

from the repo root.

Fixes #737

Change-Id: If8a91d375e3a5046d3ce18577a9f1ed135287572
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/8666
Reviewed-by: CUE cueckoo <cueckoo@gmail.com>
Reviewed-by: Paul Jolly <paul@myitcv.org.uk>
diff --git a/.gitignore b/.gitignore
index 8fa3368..004cbb9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 # Add no patterns to .gitignore except for files generated by the build.
 cmd/cue/cue
 **/*.test
+/dist