Build the binaries with the following commands:
go build ./cmd/drone-buildx-gcr
./drone-buildx-gcr
export PLUGIN_TAG=latest
export PLUGIN_REPO=octocat/hello-world
export DRONE_COMMIT_SHA=d8dbe4d94f15fe89232e0402c6e8a0ddf21af3ab
./drone-buildx-gcr
Create your pull request for the release. Get it merged then tag the release. The release will be published and changelog will be generated.