Added a release workflow triggerred on a tag.

Signed-off-by: dblock <dblock@amazon.com>

.github/workflows/release.yml

@@ -0,0 +1,66 @@
+name: Draft a Release
+
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  draft-a-release:
+    name: Draft a Release
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      issues: write
+
+    steps:
+      - name: Checkout the repo
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: "20"
+
+      - name: Build
+        run: npm ci && npm run merge
+
+      - name: Upload Artifacts
+        id: upload
+        uses: actions/upload-artifact@v4
+        with:
+          name: build
+          path: |
+            build/*
+
+      - name: Release Specification to GitHub
+        id: release
+        uses: marvinpinto/action-automatic-releases@v1.2.1
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          automatic_release_tag: ${{ github.ref_name }}
+          prerelease: true
+          title: OpenSearch OpenAPI Spec (${{ github.ref_name }})
+          files: |
+            LICENSE.txt
+            build/*
+
+      - name: Extract Changelog
+        id: changelog
+        uses: sean0x42/markdown-extract@v2
+        with:
+          file: CHANGELOG.md
+          pattern: Unreleased
+
+      - name: Update Release Description
+        id: update
+        uses: tubone24/update_release@v1.3.1
+        env:
+          TAG_NAME: ${{ github.ref_name }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          body: |
+            ${{ steps.changelog.outputs.markdown }}
+
+            ### Links
+            - [Build Artifact](${{ steps.upload.outputs.artifact-url }})