build: Refactor helm-chart upload

.drone.yml

@@ -40,16 +40,20 @@ steps:
 - name: Package & publish
   image: bv11-cr01.bessems.eu/proxy/alpine/helm
   commands:
-  - |
-    apk add yq
   - |
     helm package ./charts/json-server
   - |
-    CHART_VERSION=$(cat ./charts/json-server/Chart.yaml | yq '.version')
-    curl \
-      --header "Authorization: token $GIT_APIKEY" \
-      --upload-file json-server-$CHART_VERSION.tgz \
-      https://code.spamasaurus.com/api/packages/$GIT_USERNAME/helm/api/charts
+    helm plugin install https://github.com/chartmuseum/helm-push
+  - |
+    helm repo add \
+      --username $GIT_USERNAME \
+      --password $GIT_APIKEY \
+      spamasaurus \
+      https://code.spamasaurus.com/api/packages/$GIT_USERNAME/helm
+  - |
+    helm cm-push \
+      spamasaurus \
+      json-server-*.tgz
   environment:
     GIT_APIKEY:
       from_secret: git_apikey