Disable OTLP metrics exporter in CI, update navidrome to main tag

The Dagger Python SDK's OTLP metrics exporter hits a non-functional
local endpoint (500s), burning ~9s per retry cycle. Set
OTEL_METRICS_EXPORTER=none in the build-dagger CI job.

Also update navidrome kustomization to the main-SHA tag (c86b5d7).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.forgejo/workflows/build-container.yaml

@@ -73,6 +73,10 @@ jobs:
     needs: detect
     if: needs.detect.outputs.dagger != '[]'
     runs-on: k8s
+    env:
+      # Disable Python SDK OTLP metrics exporter — the Dagger engine's local
+      # OTLP endpoint returns 500s, causing ~9s retry cycles per minute.
+      OTEL_METRICS_EXPORTER: none
     strategy:
       matrix:
         container: ${{ fromJson(needs.detect.outputs.dagger) }}

argocd/manifests/navidrome/kustomization.yaml

@@ -11,4 +11,4 @@ resources:
   - ingress-tailscale.yaml
 images:
   - name: registry.ops.eblu.me/blumeops/navidrome
-    newTag: v0.61.1-470b4bd
+    newTag: v0.61.1-c86b5d7