🐛(CI) improve helm release

In order to avoid a github release when we build the helm chart, we use
another action

.github/workflows/release-helm-chart.yaml

@@ -27,11 +27,8 @@ jobs:
         env:
           GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
 
-      - name: Run chart-releaser
+      - name: Publish Helm charts
-        uses: helm/chart-releaser-action@v1.6.0
+        uses: numerique-gouv/helm-gh-pages@add-overwrite-option
         with:
           charts_dir: ./src/helm
-          skip_existing: True
+          token: ${{ secrets.GITHUB_TOKEN }}
-          mark_as_latest: False
-        env:
-          CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"