woodpecker: add jellyfin-ha-src CI ServiceAccount

Why:
- The jellyfin-ha-src Woodpecker build+test pipeline references a
  serviceAccountName that must exist in the woodpecker namespace.

How:
- Add a jellyfin-ha-src ServiceAccount under apps/base/woodpecker/ mirroring
  the kea-operator-ci CI account and register it in the kustomization.

apps/base/woodpecker/kustomization.yaml

@@ -8,6 +8,7 @@ resources:
   - cnpg_backup.yaml
   - cnpg_pooler.yaml
   - serviceaccount_kea_operator_ci.yaml
+  - serviceaccount_jellyfin_ha_src.yaml
   - serviceaccount_terraform_artifactapi.yaml
   - serviceaccount_terraform_authentik.yaml
   - serviceaccount_terraform_enc.yaml

apps/base/woodpecker/serviceaccount_jellyfin_ha_src.yaml

@@ -0,0 +1,6 @@
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: jellyfin-ha-src
+  namespace: woodpecker