Add initial release automation

This commmit adds the first basic release workflow to cut a release and build an SBOM.

Signed-off-by: Adolfo García Veytia (Puerco) <puerco@stacklok.com>

.github/workflows/release.yaml

@@ -0,0 +1,44 @@
+# Copyright 2023 The Protobom Authors
+# SPDX-License-Identifier: Apache-2.0
+
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write # needed to write releases 
+
+    steps:
+      - name: Set tag name
+        shell: bash
+        run: |
+          echo "TAG=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+      - uses: actions/setup-go@0c52d547c9bc32b1aa3301fd7a9cb496313a4491 # v3
+        with:
+          go-version: '1.22'
+          check-latest: true
+
+      - name: Check out code
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
+        with:
+          fetch-depth: 1
+      - name: Install bom
+        uses: kubernetes-sigs/release-actions/setup-bom@2f8b9ec22aedc9ce15039b6c7716aa6c2907df1c # v0.2.0
+      - name: Generate SBOM
+        shell: bash
+        run: |
+          bom generate --format=json -o /tmp/protobom-storage-$TAG.spdx.json .
+      - name: Publish Release
+        uses: kubernetes-sigs/release-actions/publish-release@2f8b9ec22aedc9ce15039b6c7716aa6c2907df1c # v0.2.0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          assets: "/tmp/protobom-storage-$TAG.spdx.json"
+          sbom: false