Add a goreleaser configuration. (#54)

.github/workflows/releaser.yaml

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+# Documentation
+# https://goreleaser.com/ci/actions/
+#
+# To test the workflow in a presubmit
+#   1. Push to a branch and create a PR
+#   2. Create a new release in GitHub
+#      * Mark it as a pre-release
+#      * Create the release from the branch you pushed
+#      
+#      Using the CLI something like
+# gh release create v0.0.1-pre1 -p --target=jlewi/kubedr --title="goreleaser test" --notes="goreleaser test"
+#
+# This will trigger a release from that branch.
+#
+# Change the on section to [push]. I think you may also want
+# to add the dry-run flag to the goreleaser step.
+name: goreleaser
+
+# n.b. uncomment to debug in presubmit
+on:
+  push:
+    # run only against tags
+    tags:
+      - '*'
+
+permissions:
+  contents: write
+  # packages: write
+  # issues: write
+
+jobs:
+  goreleaser:
+    # We can use macos-latest to run on macos but we shouldn't need to do this because
+    # Its pure go so we can cross-compile for mac on ubuntu.
+    runs-on: ubuntu-latest    
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - run: git fetch --force --tags
+      - uses: actions/setup-go@v4
+        with:
+          go-version: stable
+      # More assembly might be required: Docker logins, GPG, etc. It all depends
+      # on your needs.
+      - uses: goreleaser/goreleaser-action@v4
+        with:
+          # either 'goreleaser' (default) or 'goreleaser-pro':
+          distribution: goreleaser
+          version: latest
+          args: release --clean
+          workdir: .
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.goreleaser.yaml

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+# Check the documentation at https://goreleaser.com
+builds:
+  - binary: hydros
+    main: ./cmd
+    env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - windows
+      - darwin
+
+    # N.B. No need to build for 386 architecture
+    goarch:
+      - amd64
+      - arm64
+
+    # Custom ldflags templates.
+    # Default is `-s -w -X main.version={{.Version}} -X main.commit={{.Commit}} -X main.date={{.Date}} -X main.builtBy=goreleaser`.
+    #ldflags:
+      #- "-s -w -X github.com/jlewi/roboweb/kubedr/cmd/commands.version={{.Version}} -X github.com/jlewi/roboweb/kubedr/cmd/commands.commit={{.Commit}} -X github.com/jlewi/roboweb/kubedr/cmd/commands.date={{.Date}} -X github.com/jlewi/roboweb/kubedr/cmd/commands.builtBy=goreleaser"
+archives:
+  # https://goreleaser.com/customization/archive/?h=archives
+  - id: "binary"
+    # Setting format to binary uploads the binaries directly rather than wrapping in an archive
+    # This is convenient because you can just download the binary rather than needing to do download and unpack the binary.
+    format: binary
+  - format: tar.gz
+    # this name template makes the OS and Arch compatible with the results of uname.
+    name_template: >-
+      {{ .ProjectName }}_
+      {{- title .Os }}_
+      {{- if eq .Arch "amd64" }}x86_64
+      {{- else if eq .Arch "386" }}i386
+      {{- else }}{{ .Arch }}{{ end }}
+      {{- if .Arm }}v{{ .Arm }}{{ end }}
+    # use zip for windows archives
+    format_overrides:
+    - goos: windows
+      format: zip
+    # https://goreleaser.com/customization/archive/?h=archives#packaging-only-the-binaries
+    # This is a trick to ensure only the binaries get packaged in the archive and not the readme.
+    files:
+      - none*
+checksum:
+  name_template: 'checksums.txt'
+snapshot:
+  name_template: "{{ incpatch .Version }}-next"
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - '^docs:'
+      - '^test:'
+
+# The lines beneath this are called `modelines`. See `:help modeline`
+# Feel free to remove those if you don't want/use them.
+# yaml-language-server: $schema=https://goreleaser.com/static/schema.json
+# vim: set ts=2 sw=2 tw=0 fo=cnqoj