add github action for releases

Author: zainasir

.github/workflows/release.yml

@@ -0,0 +1,51 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - "v*"
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        lambda: [lfs-broker, lfs-snapshot]
+        goarch: [amd64, arm64]
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: ${{ matrix.lambda }}/go.mod
+
+      - name: Build
+        working-directory: ${{ matrix.lambda }}
+        run: GOOS=linux GOARCH=${{ matrix.goarch }} CGO_ENABLED=0 go build -tags lambda.norpc -o bootstrap main.go
+
+      - name: Package
+        working-directory: ${{ matrix.lambda }}
+        run: zip ${{ matrix.lambda }}-linux-${{ matrix.goarch }}.zip bootstrap
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.lambda }}-linux-${{ matrix.goarch }}
+          path: ${{ matrix.lambda }}/${{ matrix.lambda }}-linux-${{ matrix.goarch }}.zip
+
+  release:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          path: artifacts
+          merge-multiple: true
+
+      - name: Create release
+        uses: softprops/action-gh-release@v2
+        with:
+          generate_release_notes: true
+          files: artifacts/*.zip

README.md

@@ -350,6 +350,28 @@ full and incremental migration approaches.
 
 ---
 
+## Releases
+
+Pre-built Lambda zip files are published as GitHub Release assets on every
+tagged version. Each release includes builds for both architectures:
+
+| Asset | Architecture |
+|---|---|
+| `lfs-broker-linux-amd64.zip` | x86_64 |
+| `lfs-broker-linux-arm64.zip` | arm64 |
+| `lfs-snapshot-linux-amd64.zip` | x86_64 |
+| `lfs-snapshot-linux-arm64.zip` | arm64 |
+
+### Creating a release
+
+```bash
+git tag v1.0.0
+git push origin v1.0.0
+```
+
+The GitHub Actions workflow builds both lambdas for both architectures and
+attaches the zips to the release automatically.
+
 ## Background
 
 This project was built to solve a specific problem for the