Add new job step which writes latest helm chart version to JSON file.

Author: tomaz-s1

.github/workflows/release.yml

@@ -46,6 +46,15 @@ jobs:
         with:
           charts_dir: charts
 
+      - name: Write latest stable version to info.json file
+        run: |
+          # We write latest stable version info to JSON file which we can query for displaying
+          # badge in the readme
+          CHART_VERSION=$(cat charts/scalyr-agent/Chart.yaml | grep "version: " | sed "s/version: //g" | tr -d "\n")
+          echo '{"scalyrAgent": "v'${CHART_VERSION}'"}' > info.json
+          git add info.json
+          git push origin gh-pages
+
       - name: Notify Slack on Failure
         # NOTE: github.ref is set to pr ref (and not branch name, e.g. refs/pull/28/merge) for pull
         # requests and that's why we need this special conditional and check for github.head_ref in