add release workflow

.github/workflows/release.yml

@@ -0,0 +1,26 @@
+on:
+  push:
+    tags:
+      - '*.*.*'
+
+name: Release 
+jobs:
+  goreleaser:
+    name: Create Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.16
+
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          args: release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+

.goreleaser.yml

@@ -0,0 +1,17 @@
+dist: artifacts
+before:
+   hooks:
+     - go mod download
+builds:
+  - env:
+    - CGO_ENABLED=0
+    goos:
+    - linux
+    - darwin
+    - freebsd
+    goarch:
+    - amd64
+    - arm
+    - arm64
+    ldflags: -s -w -X main.version={{.Version}}
+    binary: bird_exporter