chore: Pass password through stdin

.gitea/workflows/actions.yaml

@@ -62,7 +62,6 @@ jobs:
 
   build_chart:
     name: Helm chart
-    container: node:21-bullseye
     runs-on: dind-rootless
     needs: semrel_dryrun
 
@@ -86,9 +85,9 @@ jobs:
           helm package ./charts/spamasaurusrex
       - name: Add target helm repository
         run: |
-          helm repo add \
+          echo "$GIT_APIKEY" | helm repo add \
             --username $GIT_USERNAME \
-            --password $GIT_APIKEY \
+            --password-stdin \
             spamasaurus \
             https://code.spamasaurus.com/api/packages/$GIT_USERNAME/helm
       - name: Push helm chart