Add initial goreleaser to create plugin binary

.github/workflows/release.yaml

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+name: Release
+on:
+  push:
+    tags:
+    - 'v*.*.*'
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@master
+    - name: Setup Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: 1.17
+    - name: GoReleaser
+      uses: goreleaser/goreleaser-action@v2
+      with:
+        version: latest
+        args: release --rm-dist
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

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+
+dist/

.goreleaser.yml

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+# This is an example .goreleaser.yml file with some sensible defaults.
+# Make sure to check the documentation at https://goreleaser.com
+before:
+  hooks:
+    # You may remove this if you don't use go modules.
+    - go mod tidy
+    # you may remove this if you don't need go generate
+    - go generate ./...
+builds:
+  - env:
+      - CGO_ENABLED=0
+    binary: kubectl-finalizers
+    goos:
+      - linux
+      - darwin
+    goarch:
+      - amd64
+checksum:
+  name_template: 'checksums.txt'
+snapshot:
+  name_template: "{{ incpatch .Version }}-next"

.krew.yaml

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+apiVersion: krew.googlecontainertools.github.com/v1alpha2
+kind: Plugin
+metadata:
+  name: finalizers
+spec:
+  version: {{ .TagName }}
+  homepage: https://github.com/ibuildthecloud/finalizers
+  platforms:
+  - selector:
+      matchLabels:
+        os: darwin
+        arch: amd64
+    {{addURIAndSha "https://github.com/ibuildthecloud/finalizers/releases/download/{{ .TagName }}/finalizers_{{ .TagName }}_darwin_amd64.tar.gz" .TagName }}
+    files:
+    - from: "*"
+      to: "."
+    bin: kubectl-finalizers
+  - selector:
+      matchLabels:
+        os: linux
+        arch: amd64
+    {{addURIAndSha "https://github.com/ibuildthecloud/finalizers/releases/download/{{ .TagName }}/finalizers_{{ .TagName }}_linux_amd64.tar.gz" .TagName }}
+    files:
+    - from: "*"
+      to: "."
+    bin: kubectl-finalizers
+  shortDescription: List objects blocked by finalizers.
+  description: |
+    List objects blocked by finalizers.