[test] Add changeset checker workflow

.github/workflows/changeset-checker.yml

@@ -0,0 +1,75 @@
+# -------------------------------------------------------------------------------------
+#
+# Copyright (c) 2023, WSO2 LLC. (https://www.wso2.com).
+#
+# WSO2 LLC. licenses this file to you under the Apache License,
+# Version 2.0 (the "License"); you may not use this file except
+# in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+# --------------------------------------------------------------------------------------
+
+# This workflow will check if a submitted PR has changesets.
+
+name: 🦋 Check for Changeset
+
+on:
+  workflow_run:
+    workflows: ["Receive PR"]
+    types:
+      - completed
+
+env:
+    GH_TOKEN: ${{ secrets.RELEASE_BOT_TOKEN }}
+
+jobs:
+  upload:
+    runs-on: ubuntu-latest
+    if: >
+      github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.conclusion == 'success'
+    steps:
+      - name: 'Download artifact'
+        uses: actions/[email protected]
+        with:
+          script: |
+            var artifacts = await github.actions.listWorkflowRunArtifacts({
+               owner: context.repo.owner,
+               repo: context.repo.repo,
+               run_id: ${{github.event.workflow_run.id }},
+            });
+            var matchArtifact = artifacts.data.artifacts.filter((artifact) => {
+              return artifact.name == "pr"
+            })[0];
+            var download = await github.actions.downloadArtifact({
+               owner: context.repo.owner,
+               repo: context.repo.repo,
+               artifact_id: matchArtifact.id,
+               archive_format: 'zip',
+            });
+            var fs = require('fs');
+            fs.writeFileSync('${{github.workspace}}/pr.zip', Buffer.from(download.data));
+      - run: unzip pr.zip
+
+      - name: 'Comment on PR'
+        uses: actions/github-script@v3
+        with:
+          github-token: ${{ env.GH_TOKEN }}
+          script: |
+            var fs = require('fs');
+            var issue_number = Number(fs.readFileSync('./NR'));
+            await github.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: issue_number,
+              body: 'Everything is OK. Thank you for the PR!'
+            });