Test with explicit host labels in registration

Added --labels flag to registration command:
- Explicitly specify host execution during registration
- Should override any container-based execution
- Testing if Docker daemon errors are finally resolved

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

forgejo-runner-helm/templates/secret.yaml

@@ -0,0 +1,9 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: {{ include "forgejo-runner.fullname" . }}-secret
+  labels:
+    {{- include "forgejo-runner.labels" . | nindent 4 }}
+type: Opaque
+data:
+  token: {{ required "forgejo.runner_registration_token is required" .Values.forgejo.runner_registration_token | b64enc | quote }}