build: add goreleaser to build tool (#6)

Add the `goreleaser` tool to the repository to handle building and
publishing the application. Add a simple configuration file to build the
application for all major OS versions.
Update the Makefile to include commands to build release and snapshot
versions of the tool.
Add a placeholder CHANGELOG file to be included in the package files.

.goreleaser.yml

@@ -0,0 +1,34 @@
+# This is an example goreleaser.yaml file with some sane defaults.
+# Make sure to check the documentation at http://goreleaser.com
+before:
+  hooks:
+    # You may remove this if you don't use go modules.
+    - go mod download
+    # you may remove this if you don't need go generate
+    - go generate ./...
+builds:
+  - env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - windows
+      - darwin
+    goarch:
+      - amd64
+      - "386"
+      - arm
+      - arm64
+    goarm:
+      - "6"
+      - "7"
+
+archives:
+  -
+    files:
+    - LICENSE
+    - README.md
+    - CHANGELOG.md
+checksum:
+  name_template: 'checksums.txt'
+changelog:
+  skip: true

CHANGELOG.md

@@ -0,0 +1,10 @@
+# CHANGELOG
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog], and this project adheres to [Semantic Versioning].
+
+## [Unreleased]
+
+[Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
+[Semantic Versioning]: https://semver.org/spec/v2.0.0.html

Makefile

@@ -13,3 +13,9 @@ go-mod-tidy:
 format:
 	go fmt $(go list ./... | grep -v /vendor/)
 	go vet $(go list ./... | grep -v /vendor/)
+
+build/snapshot:
+	./tools/goreleaser_linux_amd64 --snapshot --rm-dist --skip-publish
+
+build/release:
+	./tools/goreleaser_linux_amd64 --rm-dist --skip-publish