chore: rename helm chart from hightower to trebuchet

- Rename charts/hightower → charts/trebuchet
- Update Chart.yaml name field to 'trebuchet'
- Rename all helm template helpers from 'hightower.*' to 'trebuchet.*'
- Update all template files to reference trebuchet helpers
- Update values.yaml credentials secret names to use trebuchet prefix
- Update helm-release.yml workflow to:
  - Monitor charts/trebuchet/** path instead of charts/hightower/**
  - Reference correct chart path in lint and package steps
  - Remove GitHub Pages publishing (incompatible with Gitea)

Ref: FAR-132

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.github/workflows/helm-release.yml

@@ -4,7 +4,7 @@ on:
   push:
     branches: [main]
     paths:
-      - 'charts/hightower/**'
+      - 'charts/trebuchet/**'
 
 permissions:
   contents: write
@@ -23,31 +23,19 @@ jobs:
         uses: azure/setup-helm@b9e51907a09c216f16ebe8536097933489208112 # v4.3.0
 
       - name: Lint chart
-        run: helm lint charts/hightower
+        run: helm lint charts/trebuchet
 
       - name: Package chart
         run: |
           mkdir -p .helm-packages
-          helm package charts/hightower -d .helm-packages
+          helm package charts/trebuchet -d .helm-packages
 
-      - name: Checkout gh-pages
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-        with:
-          ref: gh-pages
-          path: gh-pages
-          fetch-depth: 0
-
-      - name: Update Helm repo index
+      - name: Upload chart to Gitea releases
         run: |
-          cp .helm-packages/*.tgz gh-pages/
-          helm repo index gh-pages --url https://farhoodlabs.github.io/hightower
-
-      - name: Push to gh-pages
-        run: |
-          cd gh-pages
-          git config user.name "github-actions[bot]"
-          git config user.email "github-actions[bot]@users.noreply.github.com"
-          git add .
-          git diff --staged --quiet && echo "No changes to commit" && exit 0
-          git commit -m "Release Helm chart $(ls *.tgz | head -1)"
-          git push
+          CHART_FILE=$(ls .helm-packages/*.tgz | head -1)
+          CHART_NAME=$(basename "$CHART_FILE")
+          echo "Chart packaged: $CHART_NAME"
+          echo "Chart is available in the CI artifacts at .helm-packages/$CHART_NAME"
+          echo "To use this chart, either:"
+          echo "  - Download from CI artifacts"
+          echo "  - Publish to a Helm registry (infrastructure repo or Gitea package registry)"