Add GoReleaser

.github/workflows/release.yml

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+name: goreleaser
+
+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: 1.14
+    -
+      name: Run GoReleaser
+      uses: goreleaser/goreleaser-action@v2
+      with:
+        version: latest
+        args: release --rm-dist
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

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+/go.sum
+/dist/
+/*.cia
+/*.tik
+/*.cetk
+/*.tmd

.goreleaser.yml

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+before:
+  hooks:
+  - go mod download
+builds:
+- main: ./cmd/ctrsigcheck
+  env:
+  - CGO_ENABLED=0
+  goos:
+  - linux
+  - darwin
+  - windows
+  goarch:
+  - 386
+  - amd64
+  - arm
+  - arm64
+  goarm:
+  - 5
+  - 6
+  - 7
+archives:
+- format: tar.gz
+  format_overrides:
+  - goos: windows
+    format: zip