chore: local-only flow (remove Gitea workflow) + docs for local pre-push and insecure/HTTP registries

.gitea/workflows/helm-publish.yml

@@ -1,28 +0,0 @@
-name: Helm Publish
-
-on:
-  push:
-    branches:
-      - "**"
-
-jobs:
-  package-and-push:
-    runs-on: ubuntu-latest
-    env:
-      HELM_OCI_NAMESPACE: ${{ secrets.HELM_OCI_NAMESPACE }}
-      HELM_USERNAME: ${{ secrets.HELM_USERNAME }}
-      HELM_PASSWORD: ${{ secrets.HELM_PASSWORD }}
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Setup Helm
-        uses: azure/setup-helm@v4
-        with:
-          token: ${{ github.token }}
-          version: v3.12.3
-
-      - name: Package and Push Charts
-        run: |
-          set -euo pipefail
-          bash scripts/helm_publish.sh