Adding workflow to automatically publish releases after a tag is pushed

Signed-off-by: Sarat Vemulapalli <vemulapallisarat@gmail.com>

.github/workflows/auto-release.yml

@@ -0,0 +1,22 @@
+name: Releases
+
+on:
+  push:
+    tags:
+      - '*.*.*'
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Get tag
+        id: tag
+        uses: dawidd6/action-get-tag@v1
+      - uses: actions/checkout@v2
+      - uses: ncipollo/release-action@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          bodyFile: release-notes/opensearch.release-notes-${{steps.tag.outputs.tag}}.md