Add Github Action to set version-info's announcement_url (#33642)

Co-authored-by: Ryan Laurie <iethree@gmail.com>

.github/workflows/set-announce-url.yml

+name: Set Announcement URL
+run-name: Set Announcement URL - ${{ inputs.announcement-url }}
+
+on:
+  workflow_dispatch:
+    inputs:
+      announcement-url:
+        description: 'The URL of the announcement'
+        type: string
+        required: true
+
+jobs:
+  set-announce-url:
+    runs-on: ubuntu-22.04
+    timeout-minutes: 15
+    steps:
+      - name: Validate input
+        if: ${{ !startsWith(inputs.announcement-url, 'http') }}
+        run: |
+            echo "announcement url must be a valid URL, got: ${{ inputs.announcement-url }}"
+            exit 1
+
+      - name: Configure AWS credentials
+        uses: aws-actions/configure-aws-credentials@v3
+        with:
+          aws-access-key-id: ${{ secrets.AWS_S3_RELEASE_ACCESS_KEY_ID }}
+          aws-secret-access-key: ${{ secrets.AWS_S3_RELEASE_SECRET_ACCESS_KEY }}
+          aws-region: ${{ vars.AWS_REGION }}
+      - name: Update announcement url
+        uses: actions/github-script@v6
+        id: announce_url
+        with:
+          result-encoding: string
+          script: |
+            // TODO: move this to the release/ directory when it exists
+            const fs = require('fs');
+
+            const announcementUrl = '${{ inputs.announcement-url }}';
+
+            const OSSversionInfo = await fetch(`http://${{ vars.AWS_S3_STATIC_BUCKET }}.s3.${{ vars.AWS_REGION }}.amazonaws.com/version-info.json`).then(r => r.json());
+            const EEversionInfo = await fetch(`http://${{ vars.AWS_S3_STATIC_BUCKET }}.s3.${{ vars.AWS_REGION }}.amazonaws.com/version-info-ee.json`).then(r => r.json());
+
+            OSSversionInfo.latest.announcement_url = announcementUrl;
+            EEversionInfo.latest.announcement_url = announcementUrl;
+
+            if (!OSSversionInfo.older.length || !EEversionInfo.older.length) {
+              throw new Error('No older versions found in version-info.json');
+            }
+
+            fs.writeFileSync('version-info.json', JSON.stringify(OSSversionInfo));
+            fs.writeFileSync('version-info-ee.json', JSON.stringify(EEversionInfo));
+
+      - name: Upload new version-info.json to s3
+        run: |
+          aws s3 cp version-info.json s3://${{ vars.AWS_S3_STATIC_BUCKET }}/version-info.json
+          aws s3 cp version-info-ee.json s3://${{ vars.AWS_S3_STATIC_BUCKET }}/version-info-ee.json
+      - name: Create cloudfront invalidation for version-info.json and version-info-ee.json
+        run: |
+          aws cloudfront create-invalidation \
+          --distribution-id ${{ vars.AWS_CLOUDFRONT_STATIC_ID }} \
+          --paths "/version-info.json" "/version-info-ee.json"