Adds release workflows (#93)

Signed-off-by: Sayali Gaikawad <gaiksaya@amazon.com>

.github/workflows/release-drafter.yml

@@ -0,0 +1,33 @@
+name: Draft a release
+
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  draft-a-release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      issues: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - id: get_data
+        run: |
+          echo "approvers=$(cat .github/CODEOWNERS | grep @ | tr -d '* ' | sed 's/@/,/g' | sed 's/,//1')" >> $GITHUB_OUTPUT
+          echo "version=$(cat package.json | jq .version | tr -d "\"")" >> $GITHUB_OUTPUT
+      - uses: trstringer/manual-approval@v1
+        with:
+          secret: ${{ github.TOKEN }}
+          approvers: ${{ steps.get_data.outputs.approvers }}
+          minimum-approvals: 2
+          issue-title: 'Release opensearch-cluster-cdk : ${{ steps.get_data.outputs.version }}'
+          issue-body: "Please approve or deny the release of opensearch-cluster-cdk. **VERSION**: ${{ steps.get_data.outputs.version }} **TAG**: ${{ github.ref_name }}  **COMMIT**: ${{ github.sha }}"
+          exclude-workflow-initiator-as-approver: true
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        with:
+          draft: true
+          generate_release_notes: true

RELEASING.md

@@ -0,0 +1,17 @@
+- [Overview](#overview)
+- [Releasing](#releasing)
+
+## Overview
+
+This document explains the release strategy for artifacts in this organization.
+
+## Releasing
+
+The release process is standard across repositories in this org and is run by a release manager volunteering from amongst [maintainers](MAINTAINERS.md).
+
+1. Create a tag, e.g. v2.1.0, and push it to the GitHub repo.
+2. The [release-drafter.yml](.github/workflows/release-drafter.yml) will be automatically kicked off.
+3. The above release drafter workflow creates an issue asking for confirmation about the release from the mainatiners. Once approved, it creates a draft release in the repository.
+4. This draft release triggers the [jenkins release workflow](https://build.ci.opensearch.org/job/opensearch-cluster-cdk-release/) as a result of which opensearch-cluster-cdk is released on [npmjs](https://www.npmjs.com/package/@opensearch-project/opensearch-cluster-cdk).
+5. Once the above release workflow is successful, the drafted release on GitHub is published automatically.
+6. Increment "version" in package.json to the next patch release, e.g. v2.1.1.

jenkins/release.jenkinsFile

@@ -0,0 +1,11 @@
+lib = library(identifier: 'jenkins@6.0.0', retriever: modernSCM([
+    $class: 'GitSCMSource',
+    remote: 'https://github.com/opensearch-project/opensearch-build-libraries.git',
+]))
+
+standardReleasePipelineWithGenericTrigger(
+    tokenIdCredential: 'jenkins-opensearch-cluster-cdk-generic-webhook-token',
+    causeString: 'A tag was cut on opensearch-project/opensearch-cluster-cdk repository causing this workflow to run',
+    publishRelease: true) {
+        publishToNpm(publicationType: 'github')
+    }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "opensearch-cluster-cdk",
-  "version": "0.1.0",
+  "version": "1.0.0",
   "bin": {
     "cdk_v2": "bin/app.js"
   },