Add goreleaser and GH actions

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

.github/workflows/release.yml

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+# Terraform Provider release workflow.
+name: Release
+
+# This GitHub action creates a release when a tag that matches the pattern
+# "v*" (e.g. v0.1.0) is created.
+on:
+  push:
+    tags:
+      - 'v*'
+
+# Releases need permissions to read and write the repository contents.
+# GitHub considers creating releases and uploading assets as writing contents.
+permissions:
+  contents: write
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          # Allow goreleaser to access older tag information.
+          fetch-depth: 0
+      - uses: actions/setup-go@v4
+        with:
+          go-version-file: 'go.mod'
+          cache: true
+      - name: Import GPG key
+        uses: crazy-max/ghaction-import-gpg@v5
+        id: import_gpg
+        with:
+          gpg_private_key: ${{ secrets.GPG_PRIVATE_KEY }}
+          passphrase: ${{ secrets.PASSPHRASE }}
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v4
+        with:
+          args: release --clean
+        env:
+          # GitHub sets the GITHUB_TOKEN secret automatically.
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GPG_FINGERPRINT: ${{ steps.import_gpg.outputs.fingerprint }}

.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:
+  extra_files:
+    - glob: 'terraform-registry-manifest.json'
+      name_template: '{{ .ProjectName }}_{{ .Version }}_manifest.json'
+  name_template: '{{ .ProjectName }}_{{ .Version }}_SHA256SUMS'
+  algorithm: sha256
+signs:
+  - artifacts: checksum
+    args:
+      # if you are using this in 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:
+  extra_files:
+    - glob: 'terraform-registry-manifest.json'
+      name_template: '{{ .ProjectName }}_{{ .Version }}_manifest.json'
+  # If you want to manually examine the release before its live, uncomment this line:
+  # draft: true
+changelog:
+  skip: true

terraform-registry-manifest.json

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+{
+    "version": 1,
+    "metadata": {
+        "protocol_versions": ["6.0"]
+    }
+}