release: add github action to automatically generate changelog

Signed-off-by: Ramkumar Chinchani <rchincha@cisco.com>

.github/workflows/release.yml

@@ -0,0 +1,30 @@
+name: create-release
+on:
+  push:
+    # Sequence of patterns matched against refs/tags
+    tags:
+      - 'v*' # Push events to matching v*, i.e. v1.0, v1.0.0
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      # To use this repository's private action, you must check out the repository
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Generate changelog
+        id: changelog
+        uses: metcalfc/changelog-generator@v1.0.1
+        with:
+          myToken: ${{ secrets.GITHUB_TOKEN }}
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@latest
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ github.ref }}
+          body: ${{ steps.changelog.outputs.changelog }}
+          draft: false
+          prerelease: false