docs: readme

README.md

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 # goreleaser-template
+
+This is a advanced goreleaser example to start shipping a Go binary on GitHub.
+
+### Required environ variables
+
+- `DOCKERHUB_USERNAME` *
+- `DOCKERHUB_TOKEN` *
+- `GPG_PRIVATE_KEY` **
+- `GPG_PASSPHRASE` **
+
+(\*) Only required to publish to a Docker registry
+
+(\*\*) Only required to sign artifacts with a GPG key