Add goreleaser github action

Creates a new release when a new tag is pushed up to GitHub.

Signed-off-by: Chris Cummer <chriscummer@me.com>

.github/workflows/goreleaser.yml

@@ -0,0 +1,29 @@
+name: goreleaser
+
+on:
+  tags:
+    - '*'
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      -
+        name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.15
+      -
+        name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: release --rm-dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GH_PAT }}