ci: adds goreleaser and gh action

.github/workflows/release.yml

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+# This GitHub action can publish assets for release when a tag is created.
+# Currently its setup to run on any tag that matches the pattern "v*" (ie. v0.1.0).
+#
+# This uses an action (paultyng/ghaction-import-gpg) that assumes you set your
+# private key in the `GPG_PRIVATE_KEY` secret and passphrase in the `PASSPHRASE`
+# secret. If you would rather own your own GPG handling, please fork this action
+# or use an alternative one for key handling.
+#
+# You will need to pass the `--batch` flag to `gpg` in your signing step
+# in `goreleaser` to indicate this is being used in a non-interactive mode.
+#
+name: release
+on:
+  push:
+    tags:
+      - "v*"
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Unshallow
+        run: git fetch --prune --unshallow
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.15
+      - name: Import GPG key
+        id: import_gpg
+        uses: paultyng/ghaction-import-gpg@v2.1.0
+        env:
+          GPG_PRIVATE_KEY: ${{ secrets.GPG_PRIVATE_KEY }}
+          PASSPHRASE: ${{ secrets.PASSPHRASE }}
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: release --rm-dist
+        env:
+          GPG_FINGERPRINT: ${{ steps.import_gpg.outputs.fingerprint }}
+          GITHUB_TOKEN: ${{ secrets.GORELEASER_TOKEN }}

.goreleaser.yml

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+# Visit https://goreleaser.com for documentation on how to customize this
+# behavior.
+before:
+  hooks:
+    # this is just an example and not a requirement for provider building/publishing
+    - go mod tidy
+builds:
+  - env:
+      # goreleaser does not work with CGO, it could also complicate
+      # usage by users in CI/CD systems like Terraform Cloud where
+      # they are unable to install libraries.
+      - CGO_ENABLED=0
+    mod_timestamp: "{{ .CommitTimestamp }}"
+    flags:
+      - -trimpath
+    ldflags:
+      - "-s -w -X main.version={{.Version}} -X main.commit={{.Commit}}"
+    goos:
+      - freebsd
+      - windows
+      - linux
+      - darwin
+    goarch:
+      - amd64
+      - "386"
+      - arm
+      - arm64
+    ignore:
+      - goos: darwin
+        goarch: "386"
+    binary: "{{ .ProjectName }}_v{{ .Version }}"
+archives:
+  - format: zip
+    name_template: "{{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
+checksum:
+  name_template: "{{ .ProjectName }}_{{ .Version }}_SHA256SUMS"
+  algorithm: sha256
+signs:
+  - artifacts: checksum
+    args:
+      # if you are using this is a GitHub action or some other automated pipeline, you
+      # need to pass the batch flag to indicate its not interactive.
+      - "--batch"
+      - "--local-user"
+      - "{{ .Env.GPG_FINGERPRINT }}" # set this environment variable for your signing key
+      - "--output"
+      - "${signature}"
+      - "--detach-sign"
+      - "${artifact}"
+release:
+  # If you want to manually examine the release before its live, uncomment this line:
+  # draft: true
+changelog:
+  skip: true