build: add github actions

Author: ericnorris

.github/workflows/release.yaml

@@ -0,0 +1,37 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - "*"
+
+permissions:
+  contents: write
+  id-token: write
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: stable
+
+      - name: Install Cosign
+        uses: sigstore/cosign-installer@v3.8.1
+        with:
+          cosign-release: 'v2.4.3'
+
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v6
+        with:
+          version: "~> v2"
+          args: release --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.goreleaser.yaml

@@ -0,0 +1,16 @@
+builds:
+  - main: ./cmd/git-credential-github-app
+    goos:
+      - linux
+      - darwin
+    goarch:
+      - amd64
+      - arm64
+
+  - main: ./cmd/git-credential-github-app-gcpkms
+    goos:
+      - linux
+      - darwin
+    goarch:
+      - amd64
+      - arm64